Hadith 8:3198
Abu Bakr narrated to us, he said: Jarir narrated to us, from Mansur, from Mujahid, who said: Had it not been for the fact that He said: "So make hearts among the people incline toward them," the Persians and the Romans would have crowded around it.
حدثنا أبو بكر قال حدثنا جرير عن منصور عن مجاهد قال لولا أنه قال فاجعل افئدة من الناس لازدحمت عليه فارس وروم