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  

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 اللَّهِ ﷺ قَالَ الْعِلْمُ ثَلَاثَةٌ فَمَا سِوَى ذَلِكَ فَهُوَ فَضْلٌ آيَةٌ مُحْكَمَةٌ أَوْ سُنَّةٌ قَائِمَةٌ أَوْ فَرِيضَةٌ عَادِلَةٌ الحديثان ضعيفان  

[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  

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