With accent marks:
Заста́вь дурака́ бо́гу моли́ться – он и лоб расшибёт.
Make a fool pray to God - he will break his forehead.
This proverb is about a stupid person who, being too zealous, only harms the cause.
The proverb originates from the customs of the Orthodox Church. During prayer, believers give obeisances to the earth, trying to touch the floor in the temple by the forehead.
A fool, from excessive diligence, can bow so hard that his forehead will also be smashed against a stone floor.
Other Russian proverbs
With a darling, even a hut is a paradise.
If you like sledding, you should like to carry the sled.
You see your friends in the times of trouble.
Do not look at a given horse's teeth.
The quieter you go, the further you'll get.
Water does not flow under a lying stone.
Being a guest is good, but being at home is better.
Trust but verify.