1 Kings 2.18-20,26 (Note: This is 1 Samuel in most English versions)
And Samuel served before the face of the Lord, a boy belted with an ephod of linen. And his mother would make him a small shirt, which she brought him on the specified days, when she would go up with her husband to burn the solemn offering.
And Eli blessed Elkanah and his wife, and said to him, May the Lord repay you seed of this woman, for the gift which she has made to the Lord. And they departed to their own place.
And the boy Samuel grew in wisdom and stature, and was favored by the Lord and the people.
Be therefore clothed like the chosen ones of God, holy and beloved, the gut of mercy, gentleness, modesty, leniency, patience, supporting each other and forgiving each other, if any shall have a quarrel against any other—as also Christ has forgiven you, do so also yourselves. And above all these things is love, which is the chain of perfection; and may the peace of God reign in your hearts, in which also you have been called in one body; and be thankful. May the word of Christ dwell in you richly, in all wisdom, teaching and admonishing each other, in songs and praises, and spiritual chanting in grace, singing in your heart to the Lord. And whatever you may do in word or deed, do all things in the name of the Lord Jesus Christ, giving thanks as well to God the father by him.
And every year his parents would go to Jerusalem, in the days of the passover feast. And twelve years having passed, they went up to Jerusalem, according to the custom of the days of the feast. And the days being completed, as they were returning, the boy Jesus remained in Jerusalem, and his parents did not notice. But they, assuming him to be with the group, traveled a day’s journey and looked for him among their relatives and among their acquaintances. And not finding him they returned to Jerusalem seeking him. And it so happened after three days that they found him in the temple, sitting in the midst of the teachers, listening to them, and questioning them. And all who heard him were dumbfounded at his understanding, and his answers. And seeing him, they marveled, and his mother said to him, “Son, why have you done this to us? Behold, your father and I were searching for you, sorrowing.” And he said to them, “Why were you looking for me? Or did you not know that I must be in these things which are of my father’s?” And they did not understand the word which he spoke to them.
And he went down with them, and came to Nazareth, and was subject to them. And his mother kept all these words in her heart. And Jesus grew in wisdom and age and grace with God and men.
Interesting the similarity of wording between Luke 2.53 and 1 Kings 2.26…probably intentional, as Luke consciously imitated the style of the Greek translation of the Old Testament.