Here the word "heat" describes the word "sun." The people suffering from the sun's heat is spoken of as if the heat struck them. AT: "nor will they suffer from the sun's heat" (See: [[rc://en/ta/man/translate/figs-hendiadys]] and [[rc://en/ta/man/translate/figs-metaphor]])
# for he who has mercy on them ... he will guide them
Yahweh speaks of himself in the third person. He speaks of protecting the people and caring for them as if he were their shepherd. AT: "I, the one who has mercy on them ... I will guide them" (See: [[rc://en/ta/man/translate/figs-123person]] and [[rc://en/ta/man/translate/figs-metaphor]])