Al-Awza'i (may Allah have mercy on him) says that Sabiq Barbarī (may Allah have mercy on him) informed me that Makḥūl (may Allah have mercy on him) wrote a letter to us in Dābiq addressed to Hasan Basri (may Allah have mercy on him), in which he asked about those people who are in pursuit of the enemy. The reply came: If they are not in pursuit, they should pray on the ground, and if they are in pursuit, they should pray on their mounts.
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 414
Hadith Gradingمحدثین:سنده ضعيف لجهالة حال سابق البربري، ومعناه صحيح يشهد له ما تقدم في الحديث [٤١١] عن الحسن البصري.