In this state of concern, Imaam Abu Hanifah (rahimahullah) knocked on the door of the fire worshipper. The door was answered by a female servant to whom Imaam Abu Hanifah (rahimahullah) said, “Tell your master that Abu Hanifah is at the door.” The fire worshipper came out to meet Imaam Abu Hanifah (rahimahullah), worried that he had come to collect the outstanding money, and thus began to make excuses in earnest. However, Imaam Abu Hanifah (rahimahullah) said to him, “We have a problem at hand that is far more important than the money. Look at the wall; how do we clean it without causing it damage?”

The fire worshipper was amazed at the character of Imaam Abu Hanifah (rahimahullah) and the concern that he displayed for the safety of the next person’s wealth. He thus proclaimed, “Before purifying the wall, I wish to purify myself by accepting Islam.” Saying this, he immediately brought Imaan.

(Tafseer Kabeer vol. 1 pg. 192)