Dhammapada 328-330

If a man find a prudent companion who walks with him, is wise, and lives soberly, he may walk with him, overcoming all dangers, happy, but considerate. 

If a man find no prudent companion who walks with him, is wise, and lives soberly, let him walk alone, like a king who has left his conquered country behind—like an elephant in the forest. 

It is better to live alone, there is no companionship with a fool; let a man walk alone, let him commit no sin, with few wishes—like an elephant in the forest.