Mark 14:1

Though the evangelists generally use the words pasch and azymes promiscuously, yet St. Mark distinguishes them, being really different. The pasch is used for the 14th day of the moon of the first month. But the 15th day, on which they departed out of Egypt, was the feast of the azymes, or the unleavened bread; which continued seven days, till the 21st day of the moon inclusively. (Ven. Bede) --- Pasch is also used for the sabbath day within the seven days of the solemnity; (John xix. 14.) and also for all the sacrifices made during the seven days of the feast.