This is what Yahweh says: “For three transgressions of Damascus, yes, for four, I will not turn away its punishment, because they have threshed Gilead with threshing instruments of iron;
“For three transgressions...yes, for four.” The poetic expression “three…four” is an idiom for “many.”
“threshing instruments of iron.” For more on threshing grain, see commentary on Ruth 2:17.