Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
quran:85:3 –

And ˹by˺ the witness and what is witnessed,  

and ˹by˺ the witness, Friday, and the witnessed, the day of ‘Arafa — that is how these three ˹elements˺ have been explained in hadīth: for the first one is ‘promised’, the second one is ‘a witness’ ˹that testifies˺ to deeds performed in it, while the third is ‘witnessed’ by mankind and angels (the introductory ˹particle˺ of the response to the oath has been omitted, but is implied to be laqad, ‘verily’, ˹sc. laqad qutila ashābu’lukhdūd˺):
القرآن:٨٥:٣ –

وَشَاهِدٍ وَمَشْهُودٍ  

{وشاهد} يوم الجمعة {ومشهود} يوم عرفة كذا فسرت الثلاثة في الحديث فالأول موعود به والثاني شاهد بالعمل فيه، والثالث تشهده الناس والملائكة، وجواب القسم محذوف صدره، تقديره لقد.