Nothing must be done hastily but killing of fleas

Similar English and Irish sayings:

A lean dog gets nothing but fleas A lean dog gets nothing but fleas
Dog that is idle barks at his fleas, but he that is hunting feels them not Dog that is idle barks at his fleas, but he that is hunting feels them not
He who lies down with dogs will rise with fleas He who lies down with dogs will rise with fleas

Proverbs and English sayings