977 B
For three sins of ... even for four
This is a poetic device. It does not mean that a specific number of sins had been committed, but it indicates that many sins had led to God's judgment.
Damascus
Here "Damascus" represents the people of the city of Damascus. Alternate translation: "the people of Damascus" (See: rc://en/ta/man/jit/figs-metonymy)
I will not turn away punishment
Yahweh uses two negatives here to emphasize that he would punish them. Alternate translation: "I will certainly punish those people" (See: rc://en/ta/man/jit/figs-litotes)
they threshed Gilead with sharp threshing sledges of iron
Yahweh speaks of how the people of Damascus treated the people of Gilead as if they had threshed grain with sharp iron tools or weapons. (See: rc://en/ta/man/jit/figs-metaphor)
Gilead
Here "Gilead" represents the people of the region of Gilead. Alternate translation: "the people of Gilead" (See: rc://en/ta/man/jit/figs-metonymy)