Then Samuel said, “Speak; for your servant hears.” There is no indication that Samuel's call to be a spokesman for God was fully revealed to him at that time -- he was a boy then -- but perhaps it was, and, for sure, God revealed Himself, and what was going to happen to Eli's family, to Samuel at that time.
David, being rebuked: 2 Samuel 12:7 Nathan said to
David, “You are the man. This is what Yahweh, the God of Israel, says:
‘I anointed you king over Israel, and I delivered you out of the hand of
Saul. 8 I gave you your master’s
house, and your master’s wives into your bosom, and gave you the house
of Israel and of Judah; and if that would have been too little, I would
have added to you many more such things. 9 Why
have you despised Yahweh’s word, to do that which is evil in his sight?
You have struck Uriah the Hittite with the sword, and have taken his
wife to be your wife, and have slain him with the sword of the children
of Ammon. 10 Now therefore the
sword will never depart from your house, because you have despised me,
and have taken Uriah the Hittite’s wife to be your wife.’
11 “This
is what Yahweh says: ‘Behold, I will raise up evil against you out of
your own house; and I will take your wives before your eyes, and give
them to your neighbor, and he will lie with your wives in the sight of
this sun. 12 For you did this secretly, but I will do this thing before all Israel, and before the sun.’ ”
13 David said to Nathan, “I have sinned against Yahweh.” The Bible doesn't indicate how Nathan knew about these matters, but God must have told him, in some way.
In 1 Kings 3, God appeared to Solomon in a dream, and, in the dream, Solomon asked for wisdom, above all. God granted his wish.
David, being told that he was not to build the temple: 1 Chronicles 17:3 That same night, the word of God came to Nathan, saying, 4 “Go and tell David my servant, ‘Yahweh says, “You shall not build me a house to dwell in; 5 for
I have not lived in a house since the day that I brought up Israel to
this day, but have gone from tent to tent, and from one tent to another.
6 In all places in which I have
walked with all Israel, did I speak a word with any of the judges of
Israel, whom I commanded to be shepherd of my people, saying, ‘Why have
you not built me a house of cedar?’ ” ’
Esther, who had become the queen of her
country in exile, was given a task because of her position. The very
existence of the Jews was threatened. Her relative, Mordecai, sent her this
message: Esther 4:11b “Don’t think to yourself that
you will escape in the king’s house any more than all the Jews. 14 For if you
remain silent now, then relief and deliverance will come to the Jews from
another place, but you and your father’s house will perish. Who knows if you
haven’t come to the kingdom for such a time as this?” Even though the assignment came through a relative (God is not mentioned in the book of Esther) it was what God wanted her to do.
Prophets sometimes had dreams, or visions. In Isaiah 6, Isaiah had a vision of the glory of God. In Jeremiah 24, Jeremiah had a vision of two baskets of figs. Ezekiel had some remarkable visions.
Like Joseph, Daniel interpreted the dream of a powerful ruler, but, unlike Joseph, he did so after time for reflection and prayer, apparently joined by his three friends: Daniel 2:17 Then Daniel went to his house and made the thing known to Hananiah, Mishael, and Azariah, his companions: 18 that
they would desire mercies of the God of heaven concerning this secret;
that Daniel and his companions would not perish with the rest of the
wise men of Babylon. 19 Then the secret was revealed to Daniel in a vision of the night. Then Daniel blessed the God of heaven.
Daniel interpreted other dreams. He also had visions, perhaps about end times, or the future of Israel. In Daniel 10, Daniel had a vision, or dream, that he couldn't interpret. A man, apparently an angel, told him the meaning.
In Luke 1, the angel, Gabriel, appeared to Zechariah, a priest, in the Temple. Zechariah was told that he and his wife, who had supposed that they would die childless, would have a son, John -- they were called to be his parents. Zechariah doubted the angel, and was punished by being unable to speak until the boy was born.
And Gabriel had another message, in the same chapter: 26 Now in the sixth month, the angel Gabriel was sent from God to a city of Galilee, named Nazareth, 27 to a virgin pledged to be married to a man whose name was Joseph, of David’s house. The virgin’s name was Mary. 28 Having come in, the angel said to her, “Rejoice, you highly favored one! The Lord is with you. Blessed are you among women!”
29 But when she saw him, she was greatly troubled at the saying, and considered what kind of salutation this might be. 30 The angel said to her, “Don’t be afraid, Mary, for you have found favor with God. 31 Behold, you will conceive in your womb, and give birth to a son, and will call his name ‘Jesus.’ 32 He will be great, and will be called the Son of the Most High. The Lord God will give him the throne of his father, David, 33 and he will reign over the house of Jacob forever. There will be no end to his Kingdom.”
34 Mary said to the angel, “How can this be, seeing I am a virgin?”
35 The angel answered her, “The Holy Spirit will come on you, and the power of the Most High will overshadow you. Therefore also the holy one who is born from you will be called the Son of God. 36 Behold, Elizabeth, your relative, also has conceived a son in her old age; and this is the sixth month with her who was called barren. 37 For nothing spoken by God is impossible.”
38 Mary said, “Behold, the servant of the Lord; let it be done to me according to your word.” Although Mary had a logical question, she accepted the answer, and the task, that of being mother to the Son of God.
Joseph, who was to be Mary's husband, received guidance in a dream: Matthew 1:20 But when he thought about these things, behold,
an angel of the Lord appeared to him in a dream, saying, “Joseph, son
of David, don’t be afraid to take to yourself Mary, your wife, for that
which is conceived in her is of the Holy Spirit. 21 She shall give birth to a son. You shall call his name Jesus, for it is he who shall save his people from their sins.”
The wise men were given guidance in a dream: Matthew 2:12 Being warned in a dream not to return to Herod, they went back to their own country another way.
Joseph, also in Matthew 2, was told, in a dream, to take Mary and Jesus to Egypt. He was also told to come back to Israel, after a stay in Egypt.
In Matthew 4, Jesus personally called some of his first followers.
In Matthew 9:9, Jesus called Matthew from his tax collection business.
In Acts 9, Christ, himself, visited Paul while he was on his way to Damascus to persecute the church. Soon after, Ananias had a vision, directing him to go to Paul and heal him of the blindness that had stricken him when Christ appeared to him. Both Paul and Ananias talked back, with Ananias, like Moses, suggesting that God was giving him poor guidance. (He wasn't, of course!)
In Acts 9, Dorcas/Tabitha did good works, providing for the needy. We don't know how she was called, but perhaps, just seeing the need, and that she could fill it, was her call.
In Acts 10, Peter had a vision, which directed him to go to speak to Cornelius, a Gentile, and those who were gathered there to hear what Peter had to say.
Paul had a significant vision, in Acts 16, directing his missionary party to go to Macedonia.
The entire book of Revelation seems to be a recounting of a visionary experience of John.
Thanks for reading. God is able to guide us, and He suits that guidance (including reproof) in ways appropriate to our background and personality.