Page 35 - SHMOT

Pharaoh had three advisors: Bilaam, Iyov, and Yitro. Bilaam advised him
to kill the newborn Jewish boys, Iyov remained silent, and Yitro fled. Why
didn’t Bilaam simply give the same advice to Pharaoh as he later gave to
Balak: to cause Bnei Yisrael to sin in immorality, which would prevent
the birth of their savior?

In the times of Balak, Bnei Yisrael had already received the Torah, the
antidote to the Yetzer Hara. This was why they were punished so severely
after sinning with the daughters of Moav. But, had they sinned while yet
in Egypt, they would not have been punished in this way, for they had not
yet received the Torah. They did not yet possess the tools to fight the
Yetzer Hara, so they would not have been held responsible for this sin.
Therefore, Bilaam did not present this idea to Pharaoh.

Bilaam further knew that Bnei Yisrael in Egypt held fast to their names,
their language, the secrets taught to them by Yaakov (i.e., to guard
themselves against immorality), and desisted from lashon hara. Therefore,
it would be futile to attempt to lure them to sin with the daughters of
Egypt.

Furthermore, due to the extreme physical labor placed upon them, it was
not possible to attract them into sinful relationships. They didn’t even pay
attention to their own wives, as we find that the women needed to adorn
themselves and bring along mirrors in order to be attractive in their
husbands’ eyes.