كتاب البر والصلة والآداب
45
The Book of Virtue, Enjoining Good Manners, and Joining of the Ties of Kinship
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Chapter: Being Dutiful To One's Parents, And Which Of Them Is More Entitled To It
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باب بِرِّ الْوَالِدَيْنِ وَأَنَّهُمَا أَحَقُّ بِهِ ‏‏

Abu Huraira reported that a person said:

Allah's Messenger, who amongst the people is most deserving of my good treatment? He said: Your mother, again your mother, again your mother, then your father, then your nearest relatives according to the order (of nearness).
حَدَّثَنَا أَبُو كُرَيْبٍ، مُحَمَّدُ بْنُ الْعَلاَءِ الْهَمْدَانِيُّ حَدَّثَنَا ابْنُ فُضَيْلٍ، عَنْ أَبِيهِ، عَنْ عُمَارَةَ، بْنِ الْقَعْقَاعِ عَنْ أَبِي زُرْعَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَجُلٌ يَا رَسُولَ اللَّهِ مَنْ أَحَقُّ بِحُسْنِ الصُّحْبَةِ قَالَ ‏ "‏ أُمُّكَ ثُمَّ أُمُّكَ ثُمَّ أُمُّكَ ثُمَّ أَبُوكَ ثُمَّ أَدْنَاكَ أَدْنَاكَ ‏"‏ ‏.‏
Reference : Sahih Muslim 2548 b
In-book reference : Book 45, Hadith 2
USC-MSA web (English) reference : Book 32, Hadith 6181
  (deprecated numbering scheme)