It is narrated from Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) regarding this statement of Allah, the Blessed and Exalted: "And the first forerunners among the Muhajirun and the Ansar" [Surah al-Tawbah: 100], that he said in its explanation: "They are those (Companions) who prayed with the Prophet (peace and blessings be upon him) facing both qiblahs (Bayt al-Maqdis and the House of Allah)."
Imam al-Harith bin Abi Usamah related this hadith in his Musnad (Bughyat al-Bahith: 1113).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب التفسير / 3750
Hadith Gradingمحدثین:إسناده ضعيف، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف موقوف » «أخرجه المطالب العالية لابن حجر برقم: 4136»