- Avimelach saw Yitzchock through the window.
- Yisroel is a holy nation and do not have relationships in day light. Yitzchock was a holy man, heaven forbid that he would do such a thing.
- When it says Avimelach looked out of the window, it means he gazed at the constellations of his Mazal (horoscope) and he was able to see that they were married.
- This is similar to the mother of Sisrah who also look out from the window. Sisrahs mother was a witch, she was gazing at the constellations.

(Zohar 140 side 2)