Jacob's Promise

When Yaakov was informed that Yosef was alive, he exclaimed, rav od Yosef b'ni chai, "Great! My son Yosef is still alive!" (45:28). The Midrash explains the term rav in this context means, "a great amount" - Yaakov said, "I have a great amount of reward and abundant goodness in this world and in the future era since my son Yosef is alive!" This is similar to the phrase, mah rav tuv'cha, "How great is Your goodness that You have stored away for those who fear You" (Tehillim 31:20), referring to the unending goodness in the era of redemption.

Rabbeinu Bachaye