Hadith #5065 (Sunan al-Nasa'i)
Book: The Book of Adornment
Narrator(s): al-Salt bin Muhammad bin 'Abdur Rahman الصلت بن محمد, Ghsan bin al-Aghr bin Husayn غسان بن الأغر بن حصين

The Prophet  forbade coming one’s hair except every other day.

Source: https://parallelquran.com/hadith/sunan-al-nasai-5065/