Contest: Name that reference

For hip hop heads, I have a challenge. There is a very brief and subtle reference to another groups lyrics/song in this song. It is at 1:46 and lasts for about 2.5 seconds. When I first heard it it drove me nuts for a while. I knew that he was sampling/referencing something else but I couldn't pinpoint it.
This is not easy but I think you can get it. I believe in you.

I'll give you a hint, there are 5 mc's in the group.