Whoever speaks evil to you of others will speak evil of you to others.
More Traditional Proverbs:
The believer is happy the doubter is wiseTraditional
If you want anything done, give it to the busy man
Traditional
Many lick before they bite.
Traditional
Robin Hood could brave all weathers but a thaw wind.
Traditional
Charity, not cheating
Traditional
Grist for the mill.
Traditional