No snakes at the Carter, tell the gardener cut the grass

from Lil Wayne – Carter II Lyrics on Rap Genius

No one in Wayne’s house would betray him, and he’s so confident of this that he wants the gardener to cut the grass and show that there’s no one lying there (“snake in the grass”)

Jay-Z used this phrase to explain that you find out who your real enemies are when you get involved in beef because people start piling on. He said in “The Blueprint 2”

When the grass is cut the snakes will show
Gotta thank my little homie Nas for that though
Saving me the hassle of speaking to half of these assholes

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