Also in the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep a feast unto the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.
Read Chapter 23
George Leo Haydock
Eighth. On the feast of the Passover, the 7th day after the 15th was kept holy, because the 14th, or the Phase, made also a part of the solemnity, ver. 5, 8. (Haydock)