פּירוש אויף בראשית 26:8

וַיְהִ֗י כִּ֣י אָֽרְכוּ־ל֥וֹ שָׁם֙ הַיָּמִ֔ים וַיַּשְׁקֵ֗ף אֲבִימֶ֙לֶךְ֙ מֶ֣לֶךְ פְּלִשְׁתִּ֔ים בְּעַ֖ד הַֽחַלּ֑וֹן וַיַּ֗רְא וְהִנֵּ֤ה יִצְחָק֙ מְצַחֵ֔ק אֵ֖ת רִבְקָ֥ה אִשְׁתּֽוֹ׃

און עס איז געװען, אַז ער איז דאָרטן אָפּגעװען אַ לאַנגע צײַט, האָט אבֿימֶלֶך דער מלך פֿון די פּלִשתּים אַרױסגעקוקט דורכן פֿענצטער, און געזען, ערשט יצחק שטיפט מיט זײַן װײַב רבקהן.

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).

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Chizkuni

ויהי כי ארכו לו הימים, “it happened that his days were lengthened” seeing that Yitzchok had to abstain from marital relations for an extended period; it had become permissible for him to indulge in such relations even in daytime [to prevent involuntary ejaculation.] (Compare Bereshit Rabbah 64,5);

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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.

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