Jesus is the first Rabbi in history to find a Biblical text to prove the afterlife.
"And the fact that the dead are raised Moses himself showed, in the story about the bush, where he speaks of the Lord as the God of Abraham, the God of Isaac and the God of Jacob. Now he is God not of the dead, but of the living; for to him all of them are alive."
This text was to end the existence of the Sadducees. It is not surprising out find they died out soon after.