Mishkat al-Masabih #184

Ibn Mas'ud said, ‘If anyone follows someone’s custom let him follow the custom of one who is dead, for one cannot be sure of the living not being led astray. Those to follow are Muhammad’s Companions who were the most excellent among the people, purest in heart, most profound in knowledge, most unassuming, whom God chose for companionship with His Prophet and to establish His religion. So recognise their excellence, follow their traces, and hold as fast as you can to their character and way of life, for they followed right guidance.” Razin transmitted it.