Sahih Muslim
Sahih Muslim 15c
وَحَدَّثَنِي سَلَمَةُ بْنُ شَبِيبٍ، حَدَّثَنَا الْحَسَنُ بْنُ أَعْيَنَ، حَدَّثَنَا مَعْقِلٌ، - وَهُوَ ابْنُ عُبَيْدِ اللَّهِ - عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، أَنَّ رَجُلاً، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ أَرَأَيْتَ إِذَا صَلَّيْتُ الصَّلَوَاتِ الْمَكْتُوبَاتِ وَصُمْتُ رَمَضَانَ وَأَحْلَلْتُ الْحَلاَلَ وَحَرَّمْتُ الْحَرَامَ وَلَمْ أَزِدْ عَلَى ذَلِكَ شَيْئًا أَأَدْخُلُ الْجَنَّةَ قَالَ " نَعَمْ " . قَالَ وَاللَّهِ لاَ أَزِيدُ عَلَى ذَلِكَ شَيْئًا .
Salamah ibn Shabib narrated to me; al-Hasan ibn A'yan narrated to us; Ma'qil—namely, Ibn Ubaydullah—narrated to us, from Abu al-Zubayr, from Jabir: A man asked the Messenger of Allah (peace and blessings be upon him), ‘What do you think: if I perform the prescribed prayers, fast Ramadan, regard the lawful as lawful and the forbidden as forbidden, and add nothing to that, will I enter Paradise?’ He said, ‘Yes.’ The man said, ‘By Allah, I will add nothing to that.’