Liturgia sobre Números 3:4

The Sages taught with regard to the mitzvah to be fruitful and multiply: “And when it rested, he would say: Return, Lord, to the ten thousands of the thousands of Israel” (Numbers 10:36). This teaches that the Divine Presence does not rest upon less than two thousands and two ten-thousands of the Jewish people, as the terms thousands and ten-thousands are both in the plural. Consequently, if there were two thousands and two ten-thousands of the Jewish people, less one, and this man did not engage in the mitzvah to be fruitful and multiply, is he not found to have caused the Divine Presence to be depart from the Jewish people? Abba Ḥanan said in the name of Rabbi Eliezer: A man who does not engage in procreation is liable to death, as it is stated with regard to the sons of Aaron: “And Nadab and Abihu died…and they had no children” (Numbers 3:4). This indicates that if they would have had children they would not have died. Others say: He causes the Divine Presence to depart from the Jewish people, as it is stated: “To be a God to you and to your seed after you” (Genesis 17:7). When your seed is after you, i.e., when you have children, the Divine Presence rests upon the Jewish people, but if your seed is not after you, upon whom can the Divine Presence rest? Upon wood and stones?