I'm looking for a song (listen to video)

[Guest Carlos Carrasco]

In this track you'll notice it's sampled based on a soul song that I used to have at my computer but my hard died and now I can't remember the song or artist name. Any one knows what's the original song this artist sampled from? Thank you very much I will really appreciate your help. I remember the voice was similar to Isaac Hayes and the song ended with a very very sad voice solo

 

And this is how the original song pitch (aprox)

 

Edited January 23, 2019 by Carlos Carrasco
added additional information