With accent marks:
Друзья́ познаю́тся в беде́.
You see your friends in the times of trouble.
This proverb is about a true friendship. It often happens in life that people have many friends who only call themselves friends. But should a disaster happen, only a few of them are ready to help.
The closest English equivalent is: "A friend in need is a friend indeed".
Other Russian proverbs
Some to the forest, some for firewood.
A fisherman sees a fisherman from afar.
Don't bring your set of rules in a foreign monastery
Patience and labor will grind everything.
Water wears away a stone.
Everything has its time.
The further into the forest, the more firewood is there.
Do not look at a given horse's teeth.