It is related that Zainul Abideen would pray one thousand rakahs every night, even if he were travelling. When he performed ablution he would turn yellow and during prayer he would tremble. When asked why this happened to him, he responded, “Do you not know who I stand before?” If the wind blew he would fall down unconscious out of the fear of Allah.
Once there was a fire in his house while he was prostrating in prayer. The people began to warn him, “Oh son of the messenger of Allah, FIRE! FIRE!” He did not raise his head untill the fire had extinguished itself. He was later asked why he did not respond to the cries of the people. He replied “The fire of hell had diverted my attention”.