Psalms 128:1 A song of ascents. Praiseworthy is every man who fears the Lord All of these are admonitions and disciplines. Because it is written, “Praiseworthy is the man,” “Praiseworthy is a man,” it therefore says here “every,” to include a woman.
Psalms 128:2 If...the toil of your hands He who benefits from the toil of his hands inherits two worlds. In Tractate Berachoth (8a).
Psalms 128:3 as a fruitful vine Every woman whose blood is abundant will have many children.
in the innermost parts of your house Because it is customary to have marital relations in secret. Another explanation: in the innermost parts If your wife is menstruating, put her into the innermost parts of your house so that you will not become accustomed to being with her.
your sons will be like olive shoots Just as olive trees cannot be grafted, so will your sons not have any disqualification.
Psalms 128:5 from Zion which is the gate of heaven. Moreover, in the merit of Zion they would be fruitful and multiply, as it is written (I Kings 4:20): “Judah and Israel [were] many.”
the good of Jerusalem And you shall rejoice with all the good.
Psalms 128:6 And may you see children [born] to your children and they shall not come to quarrel about halitzah, [since that is performed only if there are no children,] and then there will be peace upon Israel (addendum).
children [born] to your children They will inherit the estate, and no woman will be subject to the levir [in a levirate marriage]. Then there will be peace in the world.