Genesis 20:2

Amplified Bible

²Abraham ^[a]said [again] of Sarah his wife, “She is my sister.” So ^[b]Abimelech king of Gerar sent and took ^[c]Sarah [into his harem].

Genesis 20:2 See 12:11-13.
Genesis 20:2 The word “Abimelech” may be a royal title instead of a proper name. In either case this man is probably the father or grandfather of Abimelech king of the Philistines encountered later by Isaac (26:1).
Genesis 20:2 Sarah was about ninety years old at this time.