Leviticus 23:8

But ye shall offer an offering made by fire unto the Lord seven days, although these days were not closed to the ordinary work in the house, in the shop, and on the farm. In the seventh day is an holy convocation; ye shall do no servile work therein, as on the first day. of the annual festivals, the Passover, with the Feast of Unleavened Bread connected with it, came first in the cycle of the church-year, first in the great historic event it commemorated, first in its obligation, and first in its spiritual and typical significance.