Al-Dhahabi reported: A man said to Abu Hanifa, may Allah have mercy on him, “Fear Allah!” Abu Hanifa began to tremble, become pale, and lower his head, then he said, “May Allah reward you with good.”
Source: Siyar A’lām al-Nubalā’ 6/400
عن الذهبي قال رجل لأبي حنيفة رحمه الله اتَّقِ اللَّهَ فَانْتَفَضَ وَاصْفَرَّ وَأَطْرَقَ وَقَالَ جَزَاكَ اللَّهُ خَيْرًا
6/400 سير أعلام النبلاء الطبقة الخامسة أبو حنيفة