Revelation 7:9
“After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;”
Some of these are Jews who became Christians during the Church age, but earlier in this chapter, we see another group who are exclusively Jewish and are called out by tribes:
Revelation 7:4
“And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel.”