2 And Abraham said of Sarah, his wife, She is my sister: and Abimelech, king of Gerar, sent and took Sarah.

3 But God came to Abimelech in a dream in the night, and said to him, Truly you are a dead man because of the woman whom you have taken; for she is a man's wife. 4 Now Abimelech had not come near her; and he said, Lord, will you put to death an upright nation? 5 Did he not say to me himself, She is my sister? and she herself said, He is my brother: with an upright heart and clean hands have I done this. 6 And God said to him in the dream, I see that you have done this with an upright heart, and I have kept you from sinning against me: for this reason I did not let you come near her. 7 So now, give the man back his wife, for he is a prophet, and let him say a prayer for you, so your life may be safe: but if you do not give her back, be certain that death will come to you and all your house.

8 So Abimelech got up early in the morning and sent for all his servants and gave them word of these things, and they were full of fear. 9 Then Abimelech sent for Abraham, and said, What have you done to us? what wrong have I done you that you have put on me and on my kingdom so great a sin? You have done to me things which are not to be done. 10 And Abimelech said to Abraham, Why did you do this thing? 11 And Abraham said, Because it seemed to me that there was no fear of God in this place, and that they might put me to death because of my wife. 12 And, in fact, she is my sister, the daughter of my father, but not the daughter of my mother; and she became my wife: 13 And when God sent me wandering from my father's house, I said to her, Let this be the sign of your love for me; wherever we go, say of me, He is my brother.

14 Then Abimelech gave to Abraham sheep and oxen and men-servants and women-servants, and gave him back his wife Sarah. 15 And Abimelech said, See, all my land is before you; take whatever place seems good to you. 16 And he said to Sarah, See, I have given to your brother a thousand bits of silver so that your wrong may be put right; now your honour is clear in the eyes of all. 17 Then Abraham made prayer to God, and God made Abimelech well again, and his wife and his women-servants, so that they had children. 18 For the Lord had kept all the women of the house of Abimelech from having children, because of Sarah, Abraham's wife.

Matthew Henry's Commentary on Genesis 20:2-18

Commentary on Genesis 20:1-8

(Read Genesis 20:1-8)

Crooked policy will not prosper: it brings ourselves and others into danger. God gives Abimelech notice of his danger of sin, and his danger of death for his sin. Every wilful sinner is a dead man, but Abimelech pleads ignorance. If our consciences witness, that, however we may have been cheated into a snare, we have not knowingly sinned against God, it will be our rejoicing in the day of evil. It is matter of comfort to those who are honest, that God knows their honesty, and will acknowledge it. It is a great mercy to be hindered from committing sin; of this God must have the glory. But if we have ignorantly done wrong, that will not excuse us, if we knowingly persist in it. He that does wrong, whoever he is, prince or peasant, shall certainly receive for the wrong which he has done, unless he repent, and, if possible, make restitution.

Commentary on Genesis 20:9-13

(Read Genesis 20:9-13)

See here much to blame, even in the father of the faithful. Mark his distrust of God, his undue care about life, his intent to deceive. He also threw temptation in the way of others, caused affliction to them, exposed himself and Sarah to just rebukes, and yet attempted an excuse. These things are written for our warning, not for us to imitate. Even Abraham hath not whereof to glory. He cannot be justified by his works, but must be indebted for justification, to that righteousness which is upon all and unto all them that believe. We must not condemn all as hypocrites who fall into sin, if they do not continue in it. But let the unhumbled and impenitent take heed that they do not sin on, thinking that grace may abound. Abimelech, being warned of God, takes the warning; and being truly afraid of sin and its consequences, he rose early to pursue the directions given him.

Commentary on Genesis 20:14-18

(Read Genesis 20:14-18)

We often trouble ourselves, and even are led into temptation and sin, by groundless suspicions; and find the fear of God where we expected it not. Agreements to deceive generally end in shame and sorrow; and restraints from sin, though by suffering, should be thankfully acknowledged. Though the Lord rebuke, yet he will pardon and deliver his people, and he will give them favour in the sight of those with whom they sojourn; and overrule their infirmities, when they are humbled for them, so that they shall prove useful to themselves and others.