Mo money, mo murder, mo homicide
You catch that body nigga, better have that alibi
You never know it might just be yo' time you take yo' ride
To them pearly white gates, (now) watch that suicide

from AZ (Ft. Nas) – Mo Money, Mo Murder, Mo Homicide Lyrics on Rap Genius

Meaning

The more money that is involved the more people will want to have a piece of the cake. So when the inevitable happens you better have an albi when the cops come asking questions. As in you better have someone to prove your innocent.

Going to the pearly white gates is alluding to heaven. Since heaven has commonly been described to have pearly white gates which shows its richness and holyness before you meet god.

AZ commented on the song in an interview with XXL:

You heard “Life’s A Bitch.” I don’t think they heard anything else from me and him until then. That was the second song. What are they talking about? “Mo money, mo murder, mo homicide.” That’s life. More money, what’s coming is more murder and more homicide. You better have that alibi. It was like, “Wow. We were just ghetto prophets.” Just speaking true into mics. It was just in that boss zone. That’s when everybody wanted to be bosses. We were just falling into that space. We were just trying to make the best of it.

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