Adam Clarke's Bible Commentary Verse 8. Isaac was sporting with Rebekah his wife.] Whatever may be the precise meaning of the word, it evidently implies that there were liberties taken and freedom used on the occasion, which were not lawful but between man and wife.
Matthew Henry Commentary
Verses 6-11 - There is nothing in Isaac's denial of his wife to be imitated, nor eve excused. The temptation of Isaac is the same as that which overcame his father, and that in two instances. This rendered his conduct the greater sin. The falls of those who are gone before us are so man rocks on which others have split; and the recording of them is lik placing buoys to save future mariners. This Abimelech was not the sam that lived in Abraham's days, but both acted rightly. The sins of professors shame them before those that are not themselves religious.
Original Hebrew ויהי1961 כי3588 ארכו748 לו שׁם8033 הימים3117 וישׁקף8259 אבימלך40 מלך4428 פלשׁתים6430 בעד1157 החלון2474 וירא7200 והנה2009 יצחק3327 מצחק6711 את853 רבקה7259 אשׁתו׃802