Anas ibn Sirin reported that the wife of Masruq said,
« كان تعني مسروقا يصلي حتى ترم قدماه فربما جلست خلفه أبكي مما أراه يصنع بنفسه »
“Masruq رحمہ اللہ used to pray until his feet would get swollen and I would sit behind him crying after seeing what he does to himself (striving in worship).”
[Ibn Abi Duniya Tahajjud wa Qiyam al Layl 219/228]
