حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، قَالَ ‏:‏ سَأَلْتُ عَائِشَةَ كَيْفَ كَانَ عَمَلُ رَسُولِ اللَّهِ صلى الله عليه وسلم هَلْ كَانَ يَخُصُّ شَيْئًا مِنَ الأَيَّامِ قَالَتْ ‏:‏ لاَ، كَانَ كُلُّ عَمَلِهِ دِيمَةً، وَأَيُّكُمْ يَسْتَطِيعُ مَا كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَسْتَطِيعُ

'Alqamah said: 'Aishah was asked about the actions of the Messenger of Allah (PBUH). Did he perform some actions exclusively on some particular days ? She said: No, he performed his actions regularly. Which of you has the strength as much as the Messenger of Allah (PBUH) had ? Translation Not Available

Book Ref: Sunan Abi Dawud Book 5 Hadith 1370
Web Ref:  Sunan Abi Dawud Book 5 Hadith 1365