The Mekhilta According to Rabbi Ishmael taught that sets forth laws of Sabbath observance here because in God directed, "And let them make Me a sanctuary," and one might have understood that they could build the sanctuary both on weekdays and the Sabbath. The Mekhilta taught that God's direction in to "make Me a sanctuary" applied on all days other than the Sabbath. The Mekhilta posited that one might argue that since the Temple service occurs even on the Sabbath, then perhaps the preparation for the service, without which the priests could not perform the service, could occur even on the Sabbath. One might conclude that if the horn of the altar broke off or a knife became defective, one might repair them on the Sabbath. teaches, however, that even such work must be done only on weekdays, and not on the Sabbath.