Imaam Muhammad bin Saaleh Al-Uthaymeen [May Allah have mercy on him] said:
“I advise my Muslim brothers to have [a strong] desire to [act upon] the affirmed Sunan of the Prophet [sallal-laahu-alayhi-wasallam] and leave that which has not been affirmed; for indeed the Messenger [sallal-laahu-alayhi wasallam] did not leave off anything that is needed by his Ummah [nation] in their worldly affairs and affairs of the afterlife; rather he made it known.”

Fatawa fil ‘Aqeedah 2/1129