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
ahmad:11717 – Ḥasan > Ibn Lahīʿah > Darrāj > Abū al-Haytham > Abū Saʿīd al-Khudrī

[Machine] It was said to the Messenger of Allah ﷺ one day, the duration of which was fifty thousand years, how long is this day? The Messenger of Allah ﷺ said, "By the One in whose hand is my soul, it will be made light for the believer until it becomes lighter for him than performing an obligatory prayer that he prays in this world."  

أحمد:١١٧١٧ – حَدَّثَنَا حَسَنٌ حَدَّثَنَا ابْنُ لَهِيعَةَ حَدَّثَنَا دَرَّاجٌ عَنْ أَبِي الْهَيْثَمِ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ

قِيلَ لِرَسُولِ اللهِ ﷺ يَوْمًا كَانَ مِقْدَارُهُ خَمْسِينَ أَلْفَ سَنَةٍ مَا أَطْوَلَ هَذَا الْيَوْمَ؟ فَقَالَ رَسُولُ اللهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهُ لَيُخَفَّفُ عَلَى الْمُؤْمِنِ حَتَّى يَكُونَ أَخَفَّ عَلَيْهِ مِنْ صَلَاةٍ مَكْتُوبَةٍ يُصَلِّيهَا فِي الدُّنْيَا  

See similar narrations below:

Collected by Ibn Ḥibbān, Suyūṭī

ذِكْرُ الْإِخْبَارِ عَنْ وَصْفِ مَا يُخَفَّفُ بِهِ طُولُ يَوْمِ الْقِيَامَةِ عَلَى الْمُؤْمِنِينَ

ibnhibban:7334 – ʿAbdullāh b. Muḥammad b. Salm > Ḥarmalah b. Yaḥyá > Ibn Wahb > ʿAmr b. al-Ḥārith > Darrāj > Abū al-Haytham > Abū Saʿīd al-Khudrī

[Machine] From the Messenger of Allah, may ﷺ , that he said, "There was a day whose duration was fifty thousand years." It was asked, "What is the length of this day?" The Prophet, may ﷺ , replied, "By the One in whose hand is my life, it will be made easy for the believer until it becomes easier for him than performing an obligatory prayer in this worldly life."  

ابن حبّان:٧٣٣٤ – أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ سَلْمٍ قَالَ حَدَّثَنَا حَرْمَلَةُ بْنُ يَحْيَى قَالَ حَدَّثَنَا ابْنُ وَهْبٍ قَالَ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ عَنْ دَرَّاجٍ عَنْ أَبِي الْهَيْثَمِ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ

عَنْ رَسُولِ اللَّهِ ﷺ أَنَّهُ قَالَ {يَوْمٍ كَانَ مِقْدَارُهُ خَمْسِينَ أَلْفَ سَنَةٍ} فَقِيلَ مَا أَطْوَلَ هَذَا الْيَوْمَ فَقَالَ النَّبِيُّ ﷺ «وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهُ لَيُخَفِّفُ عَلَى الْمُؤْمِنِ حَتَّى يَكُونَ أَخَفَّ عَلَيْهِ مِنْ صَلَاةٍ مَكْتُوبَةٍ يُصَلِّيهَا فِي الدُّنْيَا»  

suyuti:24120a –
Request/Fix translation

  

السيوطي:٢٤١٢٠a –

"وَالَّذِي نَفْسِي بِيَدِهِ إِنَّه لَيُخَفَّفُ على المؤمِن حتى يكونَ أهونَ عليه صلاةٍ مكتوبةٍ يصليها في الدُّنيا -يعني يوم القيامة-".  

[حم] أحمد [ع] أبو يعلى وابن جرير، [حب] ابن حبّان [ق] البيهقى في السنن في البعث، [ض] ضياء المقدسي في مختاره عن أبي سعيد