Some translations set poetry farther to the right than the rest of the text to show that it is poetry. The ULB does this with the poetry in this chapter.
The practice of fasting became more common after the exile. This was intended to bring people into a right relationship with God by creating a designated time to concentrate on him. It may have been believed that Yahweh heard people better when they fasted. The significance of fasting is derived from the faster's attitude of repentance and faith in Yahweh and not the practice itself. (See: [[rc://en/tw/dict/bible/kt/repent]] and [[rc://en/tw/dict/bible/kt/faith]])
The people did not truly seek Yahweh every day. They practiced the outward aspects of the Jewish religion, but their hearts were far from Yahweh. (See: [[rc://en/ta/man/jit/figs-explicit]])