Ammar, the freed slave of Banu Hashim, narrates from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that in "And by the witness and the witnessed" [Surah al-Buruj: 3], "the witness" means the day of Jumu'ah and "the witnessed" means the day of Arafah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5562
Hadith Gradingمحدثین:قوي
Hadith Takhrij«قوي۔ أخرجه ابن جرير في تفيسره 12/520»