nourish a viper in (one's) bosom
To befriend, look after, or take care of someone who proves to be traitorous, untrustworthy, deceitful, or ungrateful.
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Perhaps a Russian speaker will know the exact sense of this aphorism. But can you explain it to help us?
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Natalia is correct. I found reference to this statement from Aesop's Fables and Chaucer and later William Shakespear.
The more common idiom taking the snake's perspective might be, "[don't] bite the hand that feeds you."
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