And it shall come to pass, that from one new moon to another, and from one sabbath to another, shall all flesh come to worship before me, saith the LORD.
This says nothing about "celebrating Sabbath eternally." It does say that we will worship eternally, but that is it.
I don't have a problem with that.
SD
Exodus 31:16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.
You're not gonna tell me only jews will celebrate Sabbath in heaven?