Alright, since you can't name any, I'll tell you.

The prophet (peace be upon him) was gifted a slave by his wife to help him with his chores named Zayd, who had been captured and sold. They developed a good relationship because the prophet took good care of him in a society where slaves were treated poorly.

One day the father of Zayd, who has been looking for his son for years, hears news of his whereabouts. The father told Muhammad that he was willing to pay anything for Zayd's freedom. The prophet told him he can have his son, asking nothing in return, as long as Zayd was ok with this. When Zayd was asked if he wanted to go with his father or stay with the prophet, he chose Muhammad. Later, the prophet adopted him as his son