said. Abraham's expedient = the next assault on Abraham in the Great Conflict for the destruction of the promised seed of the woman (Gen_3:15). See App-23. God had to intervene (Gen_20:3), for man could know nothing of it. Abraham's fear shown in Gen_20:11.
my sister = half-sister. See note on Gen_20:12 and App-29.
Abimelech. Hebrew. Father-king. The official title of the kings of Gerar (Compare Gen_26:1), like Pharaoh in Egypt.
took. See note on Gen_21:7. In Sarah's conception God must have renewed her youth, for she nursed Isaac (Gen_21:7).