You won't remember why they came to clip me
When time go by you'll soon forget me

from Nas – Untitled Lyrics on Rap Genius

Meaning

Since the alphabet boys are after him that could erase him from history people won´t remember why they killed him. Erase his records databases, lincenses, inprison him. Think Cristopher Dorners situation while everybody who didn´t read his manifesto just believes he was another crook. Or when CIA killed Che Guevara.

He has a bit similar line on his album Life is Good:

It ain’t the Truman show; it’s the human show
As the F.B.I. agent at his cubicle
Chews on his pencil eraser with intents to erase you

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