Narrated Abdullah ibn Amr ibn al-'As: The Prophet (ﷺ) said: Knowledge has three categories; anything else is extra; a precise verse, or an established sunnah (practice), or a firm obligatory duty.

Narrated Abdullah ibn Amr ibn al-'As: The Prophet (ﷺ) said: Knowledge has three categories; anything else is extra; a precise verse, or an established sunnah (practice), or a firm obligatory duty.

حَدَّثَنَا أَحْمَدُ بْنُ عَمْرِو بْنِ السَّرْحِ، أَخْبَرَنَا ابْنُ وَهْبٍ، حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ زِيَادٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ رَافِعٍ التَّنُوخِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ عَمْرِو بْنِ الْعَاصِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ الْعِلْمُ ثَلاَثَةٌ وَمَا سِوَى ذَلِكَ فَهُوَ فَضْلٌ آيَةٌ مُحْكَمَةٌ أَوْ سُنَّةٌ قَائِمَةٌ أَوْ فَرِيضَةٌ عَادِلَةٌ ‏"‏ ‏.‏