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
bayhaqi:8456 – Abū ʿAbdullāh al-Ḥāfiẓ > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Muḥammad b. Isḥāq > Abū al-Aswad > Ibn Lahīʿah > Darrāj Abū al-Samḥ > Abū al-Haytham > Abū Saʿīd al-Khudrī

[Machine] The Messenger of Allah ﷺ said that winter is the spring of the believer. Its days are short, so he fasts, and its nights are long, so he prays.  

البيهقي:٨٤٥٦ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا مُحَمَّدُ بْنُ إِسْحَاقَ ثنا أَبُو الْأَسْوَدِ ثنا ابْنُ لَهِيعَةَ عَنْ دَرَّاجٍ أَبِي السَّمْحِ عَنْ أَبِي الْهَيْثَمِ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ

قَالَ رَسُولُ اللهِ ﷺ الشِّتَاءُ رَبِيعُ الْمُؤْمِنِ قَصُرَ نَهَارُهُ فَصَامَ وَطَالَ لَيْلُهُ فَقَامَ  

See similar narrations below:

Collected by Suyūṭī
suyuti:11092a –
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السيوطي:١١٠٩٢a –

"الشِّتَاءُ ربيعُ المؤمِنِ، قَصُرَ نَهارُه فصَامَهُ، وطَال لَيلهُ فَقَامَهُ".  

العسكرى في الأمثال هِب، [ق] البيهقى في السنن عن أي سعيد