See the Difference Between My Son and Esav

Leah said, "See the difference between my son and my father-in-law's sons." Esav sold his birthright willingly, yet he hated Yaakov (Bereishis 27:41). Reuven gave up his birthright to Yosef against his will, yet he was not jealous. On the contrary, the Torah says, "Reuven heard, and he rescued him from their hand" (Bereishis 37:21). Chazal read the very name Reuven as "see the difference."