Just as one who is to be admitted to Judaism must first submit to the three ceremonies of circumcision, baptism, and sacrifice, so Israel did not receive the Torah until they had performed these three ceremonies. They had already undergone circumcision in Egypt. Baptism was imposed upon them two days before the revelation on Mount Sinai. On the day preceding the revelation Moses recorded in a book the covenant between Israel and their God, and on the morning of the day of the revelation, sacrifices were offered as a strengthening of the covenant.