[LadyTA]

Вино́ вину́ твори́т. When wine is in, wit is out.
Literal: Wine causes guilt.

Волк в ове́чьей шку́ре. Wolf in sheep's clothing.
Literal: Wolf in sheep's pelt.

Волко́в боя́ться -- в лес не ходи́ть. If you can't stand the heat, stay out of the kitchen.
Literal: If you're afraid of wolves, don't go to the woods.

Друг познаётся в беде́. A friend in need is a friend indeed.
Literal: You get to really know your friend when trouble comes.