Sahih Al Bukhari – Book of Good Manners And Form (Al-Adab)

Volumn 008, Book 073, Hadith Number 002.
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Narated By Abu Huraira Razi Allah Anhu: A man came to Allah’s Apostle Peaec Be Upon Him and said, “O Allah’s Apostle!Peaec Be Upon Him Who is more entitled to be treated with the best companionship by me?” The Prophet Peaec Be Upon Him said, “Your mother.” The man said. “Who is next?” The Prophet Peaec Be Upon Him said, “Your mother.” The man further said, “Who is next?” The Prophet Peaec Be Upon Him said, “Your mother.” The man asked for the fourth time, “Who is next?” The Prophet Peaec Be Upon Him said, “Your father.”