xii.
14, &c.

"And this day shall be unto you for a memorial, and you shall keep it as a feast to the Lord throughout your generations.
You shall keep it a feast by an ordinance for ever." This is repeated afterwards, and the observance of this rite is confined to Israelites, Proselytes, and slaves who should be circumcised, v.

48.
The observance of the Sabbath was never to be discontinued, Ex.
xxxi.16.

"Wherefore the children of Israel shall keep the Sabbath throughout their generations, for a perpetual covenant.

It is a sign between me and the children of Israel for ever." The appointment of the Family of Aaron to be Priests, was to continue as long as the Israelites should be a nation.