17. “And on the first day of Azymes,” that is, of unleavened bread, which commenced with the Paschal solemnity, viz., on the evening of the 14th Nisan. On that evening, they should eat the Paschal lamb with unleavened bread (Exod. 12:8). On that evening commenced the feast of unleavened bread, called also the Feast of the Pasch, which continued seven days. The 14th Nisan is called the first day of Azymes, because the Feast of Azymes, or the Pasch, which was celebrated on the 15th Nisan, commenced,
Matthew 26:17