Ibrahim bin Maysarah narrates from Sayyiduna Anas (may Allah be pleased with him): I prayed four rak'ahs of Zuhr with the Prophet (peace and blessings be upon him), and two rak'ahs of Asr at Dhul-Hulayfah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5445