To eat with right hand, and to start with the right side in doing other things. Sahih al-Bukhari 5380
Arabic hadith text
حَدَّثَنَا عَبْدَانُ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا شُعْبَةُ، عَنْ أَشْعَثَ، عَنْ أَبِيهِ، عَنْ مَسْرُوقٍ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ كَانَ النَّبِيُّ صلى الله عليه وسلميُحِبُّ التَّيَمُّنَ مَا اسْتَطَاعَ فِي طُهُورِهِ وَتَنَعُّلِهِ وَتَرَجُّلِهِ. وَكَانَ قَالَ بِوَاسِطٍ قَبْلَ هَذَا فِي شَأْنِهِ كُلِّهِ.
Translation
Narrated `Aisha
The Prophet (ﷺ) used to love to start doing things from the right side whenever possible, in performing ablution, putting on his shoes, and combing his hair. (Al-Ash'ath said: The Prophet (ﷺ) used to do so in all his affairs.)