The thought here is that the punishment is deserved as well as certain. A bird is not caught unless a trap is set for it. The trap which the sinner sets for himself is sin. Can a bird fall in a snare (pach) upon the earth, where no gin (moqesh) is for him?
i.e. is set for him? The "gin" is a net with a stick for a spring, which flew up when touched, carrying part of the net with it, and thus the bird was enclosed and caught (see Kitto, 'Cyclop.,' s.v. "Fowling," 2.
36). The LXX. probably read yoqesh, as they translate, ἄνευ ἐξευτοῦ, "without a fowler." So the Vulgate, absque aucupe. The second clause should be, Shall a snare (pach) spring up from the ground without taking anything?
The snare, or trap stick, would not rise if it had not caught something. The sin is there, and the sinners shall surely not escape. When God appoints retributive punishments for the guilty, and announces the same by his prophets, they may be expected with absolute certainty.