Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
nasai:1645 – ʿAmr b. ʿAlī

"The Messenger of Allah ﷺ used to pray until he developed fissures in his feet."  

النسائي:١٦٤٥ – أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا صَالِحُ بْنُ مِهْرَانَ وَكَانَ ثِقَةً قَالَ حَدَّثَنَا النُّعْمَانُ بْنُ عَبْدِ السَّلاَمِ عَنْ سُفْيَانَ عَنْ عَاصِمِ بْنِ كُلَيْبٍ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي حَتَّى تَزْلَعَ يَعْنِي تَشَقَّقُ قَدَمَاهُ  

See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:1328 – ʿAmr b. ʿAlī > Ṣāliḥ b. Mihrān > al-Nuʿmān b. ʿAbd al-Salām > Sufyān > ʿĀṣim b. Kulayb from his father > Abū Hurayrah

"The Messenger of Allah ﷺ used to pray until he developed fissures in his feet." (Using translation from Nasāʾī 1645)   

الكبرى للنسائي:١٣٢٨ – أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنِي صَالِحُ بْنُ مِهْرَانَ قَالَ حَدَّثَنَا النُّعْمَانُ بْنُ عَبْدِ السَّلَامِ عَنْ سُفْيَانَ عَنْ عَاصِمِ بْنِ كُلَيْبٍ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ

كَانَ النَّبِيُّ ﷺ «يُصَلِّي حَتَّى تَزْلَعَ قَدَمَاهُ»