“Don’t bite the hand that feeds you.”

What does it mean?

If someone’s paying you or helping you out, you have to be careful not to make them angry or say bad things about them. Don’t turn on someone who has supported you spiritually or physically.

Where does it come from?

It was used about 600 b.c. by the Greek poet Sappho, this metaphor of a dog biting its master was first recorded in English in 1711.