Sunan al-Nasa'i The Book of Adornment 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. https://parallelquran.com/hadith/sunan-al-nasai-5065/