He who goes to bed with dogs, will wake up with fleas.
More German Proverbs:
The devil looks after his own.German
In bad fortune hold out, in good hold in.
German
Trust, beware whom!
German
Who stands bail for someone is being teased by the devil.
German
He has given the hen for the egg.
German
With great men one must allow five to be an even number.
German