‘Amr b. Shu'aib; on his father's authority, said his grandfather told that the Prophet used to take something off the side and the bottom of his beard.
Tirmidhi transmitted it, saying this is a gharib tradition.
Zaid b. Arqam reported God’s messenger as saying, “He who does not take something off his moustache is not one of us.”
Ahmad, Tirmidhi and Nasa'i transmitted it.
Ya‘la b. Murra told that when the Prophet saw some khaluq (A liquid, yellow perfume mainly composed of saffron) on him he asked whether he had a wife, and when he replied that he had not he said, “Wash it, then wash it, then wash it, and do not use it again.”
Tirmidhi and Nasa'i transmitted it.
Ibn ‘Abbas said the Prophet used to clip or take something off his moustache, and Abraham the friend of the Compassionate One used to do it.
Tirmidhi transmitted it.