Obey me or get sprayed with the sweeper
Cause I'm my brothers keeper

from Mobb Deep – The Start Of Your Ending (41st Side) Lyrics on Rap Genius

Meaning

This line originally comes from Genesis 4:9:

8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.

9 And the Lord said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother’s keeper?

10 And he said, What hast thou done? the voice of thy brother’s blood crieth unto me from the ground.

11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother’s blood from thy hand;

While Havoc might have learned the line straight from the Bible, he might also have gotten it from Nino Brown in the movie New Jack City:

http://youtu.be/I9UK03yV8oM?t=24s

To help improve the meaning of these lyrics, visit “The Start Of Your Ending (41st Side)” by Mobb Deep Lyrics and leave a comment on the lyrics box