Volume 7 · Book 65 · Hadith 292
Narrated 'Aisha: The Prophet 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 used to do so in all his affairs.)
— Sahih Bukhari, Volume 7, Book 65: Food, Meals, Hadith #292