let sleeping dogs lie; don't stir up trouble
Proverb advising against meddling in things that could bring harm; literally 'a god you don't touch won't curse you'.
With that issue, it's best to let sleeping dogs lie.
They say let sleeping dogs lie, so you'd better not interfere unnecessarily.
Common variant with たたり written in kana.
A traditional Japanese proverb; the exact origin is uncertain, but it reflects a common folk belief about avoiding unnecessary provocation.