en_tn/jer/33/20.md

Yahweh says

Yahweh is speaking of himself here. Alternate translation: "I say" (See: rc://en/ta/man/jit/figs-123person)

If you can break my covenant with day and night ... proper times

This phrase starting with "If" is a condition that is contrary to fact. No one can break God's covenant with night and day. (See: rc://en/ta/man/jit/figs-hypo)