This is the CJ's Club Mix: https://www.youtube.com/watch?v=hotDdsOF4zI
And sorry to say, it's not your tune either.
I still can't find that Marshall Jefferson mix but I'm beginning to think it could actually be another tune that merely used the vocals from Spirit Inside. hmm???
Your clip is 6:43 in length so the tune we're looking for is roughly that length, possibly slightly longer.
The "Original Serious Rope Mix" comes close in length but it isn't the right mix.
The "Marshall Jefferson Mix" is at 7:59 while all the other mixes are much longer, so it could still be that one.. maybe? :\
I've searched WhoSampled but nothing comes up.
Could also be a Hot Tracks remix: https://www.discogs.com/Various-Hot-.../master/199917
Can your friend tell you where he got the audio from? Was it from a radio show or a mix tape?