They did, but not in the way you chrstians imagine.
Bless me, please enlighten my poor misguided imagination.
They were supposed to bring mankind to observe the Seven Noachide Laws.
Yeah, yeah, yeah, I know . . . but "the bible" (ie, the "new testament") says such-and-such.
Imagine those awful Jews, tearing the "new testament" out of the Bible that had been there for a thousand years! Kinda like the mean Republicans opposing the "gay marriage" we've had since George Washington (if you see the analogy).
And why not the Ten Commandments? Those were wrote in stone. They were in the Ark of the Covenant. Why are they not applicable to all mankind? The Israelites were to be a kingdom of priests to all nations Exodus 19:6. What if the Ark with the stones were found today, do we scratch off some of them and say nevermind? What of the Ark in Heaven (Rev. 11:19)? Does it not contain the same? Are the Gentiles not to be grafted into the True Vine?