1 Corinthians 13:8 Charity never faileth: but whether there be prophecies, they shall fail; whether there be tongues, they shall cease; whether there be knowledge, it shall vanish away.
9 For we know in part, and we prophesy in part.
10 But when that which is perfect is come, then that which is in part shall be done away.
11 When I was a child, I spake as a child, I understood as a child, I thought as a child: but when I became a man, I put away childish things.
12 For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known.
13 And now abideth faith, hope, charity, these three; but the greatest of these is charity.


I don't believe the "that which is perfect" is identified. It is used as an illustration. Charity never fails.

Some have tried to make "that which is perfect" either the Bible or Jesus Christ. I don't believe it is referring to either. The context for that interpretation just isn't there. The context is charity.

Also, if prophecy and tongues are to go away, then knowledge should also. But, that isn't what it says. It's telling us that Charity is forever. It will be in heaven. Tongues, prophecies aren't necessary in heaven. And we will have full knowledge, not partial. "That which is perfect" is in the context of "for instance".