God calls the boy Samuel
While Eli's sons corrupted the priesthood, God called young Samuel by name in the night and gave him a message of judgment on Eli's house.
Yahweh came, and stood, and called as at other times, “Samuel! Samuel!” Then Samuel said, “Speak; for your servant hears.”
1 Samuel 3:10 (World English Bible)
Samuel thought Eli was calling him. After the third time, Eli realized it was Yahweh and told Samuel how to answer. As Samuel grew, God let none of his words fail, and all Israel knew he was a prophet.
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Dating notes
Undated. Samuel was a boy (1 Samuel 3:1; Josephus says 12). The date shown is an estimate.