What is worth receiving is worth returning.
More French Proverbs:
He ruins himself in promises, and clears himself by giving nothing.French
A lord of straw devours a vassal of steel.
French
A mansion pulled down is half built up again.
French
The one with a running nose always wants to blow someone else's.
French
In the tail lies the venom.
French
Good swimmers are drowned at last.
French