Midrash su Salmi 128:4

... “May the Lord bless you from Zion…” (Psalms 128:5) This comes to teach that the Holy One blesses them from the place that He blesses Israel. And from where do we learn that the blessings come out from Zion? As it says “As the dew of Hermon which runs down on the mountains of Zion…” (Psalms 133:3) and it says “May the Lord bless you from Zion, and see the good of Jerusalem all the days of your life.” (Psalms 128:5) May you merit to see the good of Jerusalem in the time to come, “And may you see children to your children, peace upon Israel.” (Psalms 128:6)