Rabbi Eliezer said: Lentils are the food of mourning and sorrow. Know thou that this is so, for when Abel had been killed, his parents were eating lentil food (as a sign) of their mourning for him in mourning and sorrow. And Jacob was eating lentil food in mourning and sorrow because the kingdom, the dominion, and the birthright belonged to Esau. Moreover, on that day Abraham, his grandfather, died.
The Israelites eat lentil food in mourning and sorrow on account of the mourning || and sorrow for the Temple, and on account of the exile of Israel. Hence thou mayest learn that the children of Esau will not fall until a remnant from Israel shall come and give to the children of Esau lentil food in mourning and sorrow, and will take away from them the dominion of the kingdom and the birthright, which Jacob acquired from (Esau) by oath, as it is said, "And Jacob said, Swear to me this day; and he sware unto him" (Gen. 25:33).