With accent marks:
Ка́шу ма́слом не испо́ртишь.
You can't spoil the porridge with butter.
From time immemorial, porridge was loved and respected in Russia. It was cooked from wheat, buckwheat, oats, etc. To make it tastier, people added more butter.
This Russian proverb is used to say that something good can not be bad even in large quantities.
Other Russian proverbs
Eggs don't teach the chicken.
Silent means consent.
If you are chasing two hares at once, you won’t catch a single one.
A holy place is never empty.
Water wears away a stone.
Being a guest is good, but being at home is better.
Where it is thin, it breaks.
One head is good, but two ones are better.