Was Esav Sincere?

Hi,

"‘And he kissed him (Bereishit 33:4)’ has dots atop it, for Esav did not kiss Yaakov with all of his heart.

"R’ Shimon bar Yochai said: It is established halachah that Esav hates Yaakov, but his mercies were reversed at that moment, and he kissed Yaakov with all of his heart."

(Midrash, Sifri Behaalotcha 69)

Have a great day,
Mordechai