Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:1982ʿUbayd b. Hishām Abū Nuʿaym al-Ḥalabī And ʿAmrū b. ʿUthmān al-Maʿná > Sufyān > Hishām b. Ḥassān Biʾisnādih Bihadhā > Fīh

He said to the barber: Start with the right side and shave it.  

أبو داود:١٩٨٢حَدَّثَنَا عُبَيْدُ بْنُ هِشَامٍ أَبُو نُعَيْمٍ الْحَلَبِيُّ وَعَمْرُو بْنُ عُثْمَانَ الْمَعْنَى قَالاَ حَدَّثَنَا سُفْيَانُ عَنْ هِشَامِ بْنِ حَسَّانَ بِإِسْنَادِهِ بِهَذَا قَالَ فِيهِ قَالَ

لِلْحَالِقِ ابْدَأْ بِشِقِّي الأَيْمَنِ فَاحْلِقْهُ