Yahweh describes a hypothetical condition to explain what would happen even if those conditions were met. Alternate translation: "Even if the mountains fell and the hills shook, my steadfast love" (See: [[rc://en/ta/man/translate/figs-hypo]])
Yahweh continuing to love his people is spoken of as if his love would not turn away from the people. Alternate translation: "I will not stop loving you" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Yahweh not canceling his covenant with the people is spoken of as if his covenant were an object that would not be shaken. This can be stated in active form. Alternate translation: "and I will not cancel my covenant of peace" or "and I will surely give you peace as I promised in my covenant" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-activepassive]])
Here Yahweh speaks about himself in the third person. It can be stated in first person. Alternate translation: "that is what I, Yahweh, who acts mercifully, say" (See: [[rc://en/ta/man/translate/figs-123person]])