Amos 3:5

Shall one take up a snare from the earth? etc.] RV 'Shall a snare spring up from the ground?' etc. The snare is the bird-trap as a whole: the gin (the word is a contraction of 'engine') is the mechanism by which the trap acts. But the trap does not go off till the bird starts it. The thought is that when the time of misfortune arrives Israel will be caught in it as the bird in the trap.

6. Israel cannot plead lack of warning (Ezekiel 33:4). All things are ordered by God, and therefore His prophets are able to give such warning. Evil here means disaster.