With accent marks:
На Бо́га наде́йся, а сам не плоша́й.
Put your trust in God, but don't make mistakes yourself
This Russian proverb is a close equivalent of the English expression "God help those who help themselves".
"Не плошай" means "do not make mistakes", it is an obsolete word and can only be seen in proverbs or books.
Other Russian proverbs
Man does not live thanks to bread alone.
If you are chasing two hares at once, you won’t catch a single one.
The apple never falls far from the tree.
A bad example is contagious.
~ Seven babysitters make the kid to lose an eye.
The quieter you go, the further you'll get.
Beast runs towards the hunter.
The eyes are scared, but the hands are doing.