John Gills Exposition of the Bible Commentary - Genesis 20:18
For the Lord had fast closed up all the wombs of the house of Abimelech ,.... With large tumours probably, so that they could not cohabit with their husbands and conceive; nor could those that had conceived bring forth: and this disorder they were smitten with: because of Sarah Abraham's wife ; who was taken into the house of Abimelech, in order to be his; to rebuke and punish for which, and to convince of the evil of it, and cause to abstain from it, this disorder was inflicted on them. read more
Matthew Henry's Complete Commentary - Genesis 20:14-18
Here is, I. The kindness of a prince which Abimelech showed to Abraham. See how unjust Abraham's jealousies were. He fancied that if they knew that Sarah was his wife they would kill him; but, when they did know it, instead of killing him they were kind to him, frightened at least to be so by the divine rebukes they were under. 1. He gives him his royal licence to dwell where he pleased in his country, courting his stay because he gives him his royal gifts (Gen. 20:14), sheep and oxen, and... read more