Fatimah, the wife of Umar ibn Abdil Aziz[Rahimahullah]: I never saw anyone that would pray ﻤمand fast as much as him. Nor did I see anyone that had as much fear as him. After Isha he would just sit and cry until sleep would overcome him. And in the middle of the night he would wake up and start crying again until sleep would overcome him. Sometimes he would be in bed and think about a matter to do with the akhirah and start shaking like a bird that shakes off water.
[‘Uluuw al Himmah]