Do not spit into the well that you might need to drink out of.
More Russian Proverbs:
Do not look for good from good.Russian
Many people who have gold in the house are looking for copper outside.
Russian
Like two drops of water.
Russian
The wolf can always be hired very cheap as a shepherd.
Russian
What you go looking for, you will find.
Russian
Fedot, yet not the one.
Russian