Reading "The sun also rises, and the sun goes down," Rabbi Abba taught that since we of course know that the sun rises and sets, means that before God causes the sun of one righteous person to set, God causes the sun of another righteous person to rise. Thus before God caused the sun of Moses to set, God caused Joshua's sun to rise, as reports, "And the Lord said to Moses: 'Take Joshua the son of Nun . . . and lay your hand upon him.'"