Deuteronomy 15:17
you shall take an awl and pierce a hole through his ear to the door. Then he will become your servant permanently (this applies to your female servant as well).
Leviticus 25:39-42
"'If your brother becomes impoverished with regard to you so that he sells himself to you, you must not subject him to slave service.
1 Samuel 1:22
but Hannah did not go up with them. Instead she told her husband, "Once the boy is weaned, I will bring him and appear before the Lord, and he will remain there from then on."
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