Mughira bin Shuba reported,

One night I was a guest of the Prophet ﷺ (and in another narration, "I hosted the Prophet ﷺ"). He gave orders for a side of meat, which was then roasted. He took up the knife and began slicing pieces from it for me.Then Bilal came to call him for the prayer. He threw down the knife and said, "What is the matter with him? May his hands be covered in dust!"Mughira said, "My moustache had grown long, so the Messenger of Allah ﷺ trimmed it for me on a tooth-stick," or he said, "Let me trim it for you on a tooth-stick."

عن المغيرة بن شعبة قال

ضفت النبي- وفي رواية: بالنبي ﷺ- ذات ليلة، فأمر بجنب فشوي. قال: فأخذ الشفرة، فجعل يحز لي بها منه. قال: فجاء بلال يؤذنه بالصلاة، فألقى الشفرة، وقال: ما له؟ تربت يداه! قال المغيرة: وكان شاربي وفى، فقصه لي رسول الله ﷺ على سواك، أو قال: أقصه لك على سواك.