וַיְהִ֗י כִּ֣י אָֽרְכוּ־ל֥וֹ שָׁם֙ הַיָּמִ֔ים וַיַּשְׁקֵ֗ף אֲבִימֶ֙לֶךְ֙ מֶ֣לֶךְ פְּלִשְׁתִּ֔ים בְּעַ֖ד הַֽחַלּ֑וֹן וַיַּ֗רְא וְהִנֵּ֤ה יִצְחָק֙ מְצַחֵ֔ק אֵ֖ת רִבְקָ֥ה אִשְׁתּֽוֹ׃
他在那裡住了很久以後，有一天，非利士人的王亞比米勒從窗戶往外觀看，看見以撒正在與他的妻子利百加親熱。
Rashi
כי ארכו WHEN HE HAD BEEN THERE A LONG TIME — He thought, “From now I need have no fear since they have not molested her up to now”, and he was not sufficiently strict in guarding his actions (Genesis 20:13).
Rashbam
ויהי כי ארכו לו שם, after a while Yitzchok was no longer careful to conduct himself in a manner that the suspicion that Rivkah was his wife could not be aroused. The reason was that he did not think that she would be abducted.
Or HaChaim
僅限進階版會員使用Chizkuni
僅限進階版會員使用Tur HaArokh
僅限進階版會員使用Kli Yakar
僅限進階版會員使用Siftei Chakhamim
僅限進階版會員使用Rashi
וישקף אבימלך וגומר AND AVIMELEKH OBSERVED, ET CETERA — He saw him having sexual relations (Genesis Rabbah 64:5).