Deuteronomy 16:6

There — Namely, in the court of the tabernacle or temple. This he prescribed, partly that this great work might be done with more solemnity in such manner as God required; partly, because it was not only a sacrament, but also a sacrifice, and because here was the sprinkling of blood, which is the essential part of a sacrifice; and partly to design the place where Christ, the true passover or lamb of God, was to be slain. At the season — About the time you were preparing yourselves for it.