EXO 12:27

27 you must tell them, ‘This ritual is [to remember how our ancestors] sacrificed [lambs] on the night that Yahweh’s angel passed by the houses of the Israeli people [when they were] in Egypt. He killed the [oldest males/sons in all] the Egyptian houses, but he spared [the sons in] [MTY] our houses.’” After Moses/I told them this, they all bowed their heads and worshiped [Yahweh].