не пили сук, на котором сидишь

"Не пили сук, на котором сидишь" is a Russian folk idiom that warns us "not to cause harm to something that essentially provides for us"

Translated nearly word-for-word:

• Не пили (ne pili) = don't saw
• сук (suk) = [the] branch
• на (na) = on
• котором (kotorom) = which
• сидишь (sidish) = [you] sit

We have several equivalents in English for this phrase:

• "don't bite the hands that feed you"
• "don't attack the one who pays you"