أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا بِشْرٌ، عَنْ يُونُسَ، عَنِ الْحَسَنِ، وَمُحَمَّدٍ، قَالاَالتَّرَجُّلُ غِبٌّ ‏.‏

It was narrated that Al-Hasan and Muhammad said

"Combing one's hair (should be done) every other day."