Deuteronomy 16:5
Thou mayest not sacrifice the passover within any of thy gates, which the Lord thy God giveth thee: (Deuteronomy 16:5)
Mayest not sacrifice.
 In the future the sacrifice might not be made in any private home or place, but only at the place appointed by Jehovah (see ch. 12:5, 11). The first Passover was eaten in the homes of the people in Egypt, on the eve of their flight. There was then no sanctuary, no holy place of assembly, to which they could gather.