Yazeed bin Kummait (rahimahullah) narrates the following:

Imaam Abu Hanifah (rahimahullah) possessed the fear of Allah Ta‘ala to a very high degree. On one occasion, ‘Ali bin Husain, the Mu’azzin, led the Esha Salaah and recited Surah Zilzaal. Imaam Abu Hanifah (rahimahullah) was also part of the congregation. After the Salaah was over and the people had departed, I looked towards Imaam Abu Hanifah (rahimahullah) and noticed that he was seated and deep in thought, breathing heavily. Seeing that he was preoccupied, I said to myself, “Let me depart, lest my presence distract him from whatever he is pondering over.” With this thought in mind, I stood and departed. At the time of my departure, the amount of oil remaining in the lamp was very little.