This speaks of the number of people in Israel increasing as if they would become as numerous as the stars. Alternate translation: "to increase the number of people in Israel to be as many as the stars in the heavens" (See: [[rc://en/ta/man/translate/figs-simile]])
Here "Israel" represents the people who live there. Alternate translation: "increase the population of Israel" (See: [[rc://en/ta/man/translate/figs-metonymy]])