Psalms 127:3

Lo, children are an heritage of the Lord - They are an inheritance derived from the Lord. They are bestowed by him as really as success is in building a house, or in guarding a city. The idea is, that everything which we value, or which we desire, is a gift from God, and is to be received as from him, and to be acknowledged as his gift. The general idea here, as in the previous verses, is that of entire dependence on God.

And the fruit of the womb is his reward - Or rather, “a reward;” that is, they are of the nature of a reward for a life of devotion to God; they are among the blessings which God promises, and are evidences of his favor. Our translation by inserting the words “is his” obscures the sense, as if the meaning were that they belong to God as his “reward” for what he does for us. The reverse of this is the true idea - that they are a blessing with which he rewards or favors his people. Of course, this is not universally true, but the promise is a general one, in accordance with the usual promises in the Bible in regard to the result of piety. Children are to be reckoned among the divine favors bestowed on us, and for their lives, their health, their virtues, and the happiness derived from them, we are, as in other things, dependent on him - as in building a house, in guarding a city, or in the rest and comfort derived from toil.