Parallel
Psalms 126:4
Swete's Septuagint · Berean Standard Bible
ὡσεὶ βέλη ἐν χειρὶ δυνατοῦ, οὕτως οἱ υἱοὶ τῶν ἐκτετιναγμένων.
127:4
Like arrows in the hand of a warrior, so are children born in one’s youth.