“And I return to my father’s house in peace” – Rabbi Yehoshua of Sikhnin in the name of Rabbi Levi: The Holy One blessed be He took the conversations of the patriarchs and rendered them the key to the redemption of the descendants. The Holy One blessed be He said to him [Jacob]: ‘You said: “[The Lord] will be [vehaya] my God,” as you live, all the goodness, blessings, and consolations that I give to your children, I give it to them only in this language,’ as it is stated: “It will be [vehaya] on that day that spring water will emerge from Jerusalem” (Zechariah 14:8).
“It will be [vehaya] on that day that the Lord will continue, setting His hand a second time to acquire the remnant of His people” (Isaiah 11:11). “It will be [vehaya] on that day, that the mountains will drip nectar” (Joel 4:18). “It will be [vehaya] on that day that a great shofar will be sounded…” (Isaiah 27:13).