It is narrated from Amr bin Dinar (may Allah have mercy on him) that a barber told me that he cut the hair of Ibn Abbas (may Allah be pleased with them), so he said: "Start from the right side."
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 1015
Hadith Takhrijفی إسنادہ مقال لإبہام الحجام الذی أخبر عمرو بن دینار أخرجہ البیہقی: 5 / 103 - وابن ابی شیبہ (14563، 14568)۔
Abu Ali Al-Azdi narrated that I heard Ibn Umar (may Allah be pleased with them both) saying to the one shaving his head: O boy, shave till the bone, and when you cut the hair, start from the right side before the left side.
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 1016
Hadith Takhrijإسنادہ ضعیف لعدم متابعۃ الأزدی أخرجہ البیہقی: 5 / 103 - وابن ابی شیبہ (14562، 14564)۔
It is narrated from Ibn Umar (may Allah be pleased with them both) that when he would shave his head during Hajj or Umrah, he would also have some hair cut from his beard and mustache.
Hadith Referenceمسند الإمام الشافعي / كتاب الحج / 1017