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.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ الْعِلْمُ ثَلاَثَةٌ وَمَا سِوَى ذَلِكَ فَهُوَ فَضْلٌ آيَةٌ مُحْكَمَةٌ أَوْ سُنَّةٌ قَائِمَةٌ أَوْ فَرِيضَةٌ عَادِلَةٌ  

"The Messenger of Allah ﷺ said: 'Knowledge is based on three things, and anything beyond that is superfluous: a clear Verse, an established Sunnah, or the rulings by which the inheritance is divided fairly.'"  

قَالَ رَسُولُ اللَّهِ ﷺ الْعِلْمُ ثَلاَثَةٌ فَمَا وَرَاءَ ذَلِكَ فَهُوَ فَضْلٌ آيَةٌ مُحْكَمَةٌ أَوْ سُنَّةٌ قَائِمَةٌ أَوْ فَرِيضَةٌ عَادِلَةٌ  

[Machine] "That the Messenger of Allah, blessings be upon him, said: knowledge is of three types and anything besides that is a favor, a decisive sign, a standing tradition, and a just obligation."  

أَنَّ رَسُولَ اللهِ صَلَّى اللهُ ﷺ قَالَ الْعِلْمُ ثَلَاثَةٌ فَمَا سِوَى ذَلِكَ فَضْلٌ آيَةٌ مُحْكَمَةٌ وَسُنَّةٌ قَائِمَةٌ وَفَرِيضَةٌ عَادِلَةٌ  

[Machine] The Messenger of Allah (PBUH) said: "Knowledge is three things, besides which there is nothing but a clear favor, a decisive sign, and an established Sunnah, and a just obligatory duty."  

قَالَ رَسُولُ اللهِ ﷺ الْعِلْمُ ثَلَاثَةٌ مَا سِوَى ذَلِكَ فَضْلٌ آيَةٌ مُحْكَمَةٌ وَسُنَّةٌ قَائِمَةٌ وَفَرِيضَةٌ عَادِلَةٌ  

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. (Using translation from Abū Dāʾūd 2885)   

أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْعِلْمُ ثَلَاثَةٌ وَمَا سِوَى ذَلِكَ فَهُوَ فَضْلٌ آيَةٌ مُحْكَمَةٌ أَوْ سُنَّةٌ قَائِمَةٌ أَوْ فَرِيضَةٌ عَادِلَةٌ  

"الْعِلمُ ثَلاثَةٌ وَمَا سِوَى ذَلِكَ فَهوَ فَضْلٌ، آيَةٌ محْكمَةٌ، وَسُنَّةٌ قَائِمَةٌ، أَوْ فَرِيضَةٌ عَادِلَةٌ ".