Amos 3:5

Will a bird fall into a net upon the earth, when there is no bait for it? The paḥmust have been a kind of net; not improbably like the bird-traps figured in Wilkinson-Birch, Ancient Egyptians, ed. 1878, ii. 103, consisting of network strained over two semicircular flaps, moving on a common axis: this was laid upon the ground, and when the bait in the middle was touched by a bird, the two flaps, by a mechanical contrivance, flew up and closed, entrapping the bird.

gin bait. The môḳçsh(lit. a fowling-instrument) is shewn by the present passage to have been something connected with the paḥ, without which the latter was useless: elsewhere it often denotes metaphorically that which alluresa person to destruction (e.g. Exodus 23:33; Deuteronomy 7:16; 1 Samuel 18:21): hence it must have been something more definite than gin, and probably corresponded nearly to what we should term the bait.

will a net spring up from the ground without taking (something)?] The construction of the paḥwas such that the flaps would not start up from the ground without a bird being there for the net to enclose.