1 Kings 11:20-21

20Tahpenes's sister gave birth to Hadad's son, called Genubath. Queen Tahpenes took care of Genubath in the king's palace. Genubath lived there with Pharaoh's own children.

21While Hadad was living in Egypt, he heard the news that King David had died. Joab, the leader of David's army, was also dead by this time. So Hadad said to Pharaoh, ‘Please let me return to my own country.’