Irak bin Malik (may Allah have mercy on him) said: I heard Sayyiduna Abu Hurayrah (may Allah be pleased with him) say: I came to Madinah while the Prophet (peace and blessings be upon him) was at Khaybar, and a man from Banu Ghifar was leading the people in prayer.
Imam al-Bayhaqi (may Allah have mercy on him) said: Then he set out after the Prophet (peace and blessings be upon him) and came to him (peace and blessings be upon him) while he was at Khaybar.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3923