וישב בין קדש ובי שור, between 2 large cities, in order to have an opportunity to proclaim the holy name of G’d in both these cities, as he did later, the objective being to improve G’d’s image among mankind.

ויבא אלוקים אל אבימלך, this visitation was of a similar kind to that reported with Lavan (31,24) and Bileam (Numbers 22,24) respectively. The Torah refrains from speaking about a מחזה, “a vision,” in order not to place these wicked people on a pedestal similar to our patriarchs. The expression דבור to describe a verbal communication to these individuals is also absent, G’d having reserved such an expression for communications with prophets, as He pointed out to Miriam and Aaron in Numbers 12,6. Avimelech did not experience a visual image of G’d in his dream at all. He perceived a divine voice addressing him.

הנך מת, the impotence which you experienced (verse 18) will result in your death.

הגוי גם צדיק, is it fair that You would kill a nation by killing its king, especially when this king is not even guilty of a mortal offence?

ועתה השב את אשת האיש, before you perish from the sickness.

וחיה, and be healed and stay alive; we find a similar construction in Joshua 5,8 עד חיותם, “until they have been healed.”

אתה וכל אשר לך, all the fetuses whose progress had been arrested within their mothers’ wombs.

Deeds that ought not to be done. You brought harm to a stranger with whom you had no prior relationship of enmity, and without profit to yourself.

רק אין יראת אלוקים במקום הזה, there is no respect for the government’s authority. The Philistines did not have kings, but their political leaders were known as סרנים, as we know from the story of Goliath, who was a law unto himself due to his personal strength and was not subject to the authority of such סרנים. Compare Goliath’s boast הלא אנכי הפלשתי ואתם עבדים לשאול, “am I not the Philistine, whereas you are slaves of Sha-ul.” (Samuel I 17,8)

וגם אמנה, also you, the king himself, have sinned in taking the woman because I said she is my sister for you should have asked me if she was also my wife. The fact is that she is both my sister and my wife.

התעו אותי אלוקים, on account of the various alien gods which I despise I have been forced to leave my father’s house and to travel to areas I did not know, not to places of my own choice. This is why he described himself as תועה, someone who wanders, does not have a fixed destination.

הנה נתתי אלף כסף לאחיך, as dowry, as was the custom for any groom marrying the daughter or sister of a man.

הנה לך כסות עינים, clothing consisting of a variety of colours which women used to wear as a mark of distinction. The dowry he gave her brother was intended to show that he did not consider her a whore but someone reputable, and that he did not mean her to be his concubine but his regular wife. Also, he meant that he would not have let Sarah go so easily except for Divine intervention which forced him to let her go.

לכל אשר אתך, before the eyes of everybody, so that they know in your household that everything is above board.

ואת כל ונוכחת, and you will be perceived exonerated in every respect even in the eyes of those who would have felt tempted to interpret what happened to you in a negative light, reflecting discredit upon you.

כי עצר עצר ה' בעד כל רחם, to kill their (unborn) offspring if Avimelech would not display remorse and penitence. G’d had warned him specifically that not only his own life was at risk (verse 7)