Mughira bin Shuba reported,

I was a guest of the Prophet ﷺ one night. He ordered that a side of meat be roasted, then took a knife and began cutting pieces from it for me.Bilal came and called him to the prayer. He set down the knife and said, "What is the matter with him, may his hands be covered in dust!" He then stood up to pray.Anbari added, "My moustache had grown long, so he trimmed it for me on a tooth-stick," or he said, "Let me trim it for you on a tooth-stick."

Abu Dawud 188

Sahih

حدثنا عثمان بن أبي شيبة ومحمد بن سليمان الأنباري المعنى قالا حدثنا وكيع عن مسعر عن أبي صخرة جامع بن شداد عن المغيرة بن عبد الله

عن المغيرة بن شعبة قال

ضفت النبي ﷺ ذات ليلة فأمر بجنب فشوي وأخذ الشفرة فجعل يحز لي بها منه قال فجاء بلال فآذنه بالصلاة قال فألقى الشفرة وقال ما له تربت يداه وقام يصل زاد الأنباري وكان شاربي وفى فقصه لي على سواك أو قال أقصه لك على سواك

أبو داود 188صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Abu Dawud
Book
Purification
Chapter
Leaving wudu for what has been touched by fire
Numbering
Darussalam 188
Abu Dawud 188