Sold my soul on the back-end
Only fucking way I’mma pay for it

from Pusha T (Ft. Jeezy & Kanye West) – Amen Lyrics on Rap Genius

Meaning

Pusha did some bad things in the back of alleys and other shady places but it’s the only way he could have paid for his luxurious lifestyle before his rapping career.

Pusha is also saying that justice will only come to him in the afterlife. He’s not going to jail and he’s not getting murdered, so he won this life, but he owes his soul later.
This line hints that Pusha may have sold his soul

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