Page 315 - BERESHIT

Hashem made Yitzchak’s facial features resemble Avraham’s. This was
to counter those who sneered at Yitzchak’s birth and attributed Sarah’s
pregnancy to Avimelech.

How did the resemblance of Avraham and Yitzchak effectively close their
mouths from scorn? The similarity to Avraham, on its own accord, was
not enough. It was only the seal of Hashem’s truth and the Torah’s word
that successfully put an end to their pernicious rumors. This is the power
of Torah, the word of the Living G-d.

Hashem told Yitzchak to stay in Canaan and not go down to Mitzrayim.
Yitzchak’s daily habits, his acts of devotion, and upright behavior proved
that he was the true son of Avraham. Derision and mockery’s caustic
comments engender tumah and propagate evil. Those who learn Torah and
bring the light of truth to the world, remove this tumah. The pure, burning
fire of Torah brings home truth and strengthens our belief in Hashem.