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:4772 – Abū ʿAbdullāh al-Ḥāfiẓ And ʾAbū Saʿīd b. Abū ʿAmr > Abū al-ʿAbbās Muḥammad b. Yaʿqūb > Aḥmad b. ʿAbd al-Ḥamīd al-Ḥārithī > Abū Usāmah > al-Walīd b. Kathīr > ʿUbaydullāh b. ʿAbdullāh b. ʿUmar > Ibn ʿUmar

[Machine] A man called the Messenger of Allah ﷺ while he was in the mosque and said, "O Messenger of Allah, how should I perform the Witr prayer?" The Messenger of Allah ﷺ said, "Whoever prays, let him pray two units, two units. If he fears that he will end up by morning in prostration, let him pray one unit."  

البيهقي:٤٧٧٢ – أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ وَأَبُو سَعِيدِ بْنُ أَبِي عَمْرٍو قَالَا ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ ثنا أَحْمَدُ بْنُ عَبْدِ الْحَمِيدِ الْحَارِثِيُّ ثنا أَبُو أُسَامَةَ عَنِ الْوَلِيدِ بْنِ كَثِيرٍ قَالَ حَدَّثَنِي عُبَيْدُ اللهِ بْنُ عَبْدِ اللهِ بْنِ عُمَرَ أَنَّ ابْنَ عُمَرَ حَدَّثَهُمْ

أَنَّ رَجُلًا نَادَى رَسُولَ اللهِ ﷺ وَهُوَ فِي الْمَسْجِدِ فَقَالَ يَا رَسُولَ اللهِ كَيْفَ أُوْتِرُ صَلَاةَ اللَّيْلِ؟ فَقَالَ رَسُولُ اللهِ ﷺ مَنْ صَلَّى فَلْيُصَلِّ مَثْنَى مَثْنَى فَإِنْ خَشِيَ أَنْ يُصْبِحَ سَجَدَ سَجْدَةً فَأَوْتَرَتْ لَهُ مَا صَلَّى  

رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنْ أَبِي كُرَيْبٍ وَغَيْرِهِ عَنْ أَبِي أُسَامَةَ

See similar narrations below:

Collected by Muslim
muslim:749f – Abū Kurayb And Hārūn b. ʿAbdullāh > Abū Usāmah > al-Walīd b. Kathīr > ʿUbaydullāh b. ʿAbdullāh b. ʿUmar > Ibn ʿUmar

A person called (the attention) of the Messenger of Allah ﷺ as he was in the mosque, and said: Messenger of Allah, how should I make the rak'ahs of the night prayer an odd number? Upon this the Messenger of Allah (may peace he upon him) said: He who prays (night prayer) he should observe it in pairs, but if he apprehends the rise of morning, he should observe one rak'ah; that would make the number odd (for the rak'ahs) observed by him. This was narrated by Abu Kuraib 'Ubaidullah b. 'Abdullah and Ibn 'Umar did not make mention of it.  

مسلم:٧٤٩f – وَحَدَّثَنَا أَبُو كُرَيْبٍ وَهَارُونُ بْنُ عَبْدِ اللَّهِ قَالاَ حَدَّثَنَا أَبُو أُسَامَةَ عَنِ الْوَلِيدِ بْنِ كَثِيرٍ قَالَ حَدَّثَنِي عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ بْنِ عُمَرَ أَنَّ ابْنَ عُمَرَ حَدَّثَهُمْ

أَنَّ رَجُلاً نَادَى رَسُولَ اللَّهِ ﷺ وَهُوَ فِي الْمَسْجِدِ فَقَالَ يَا رَسُولَ اللَّهِ كَيْفَ أُوتِرُ صَلاَةَ اللَّيْلِ فَقَالَ رَسُولُ اللَّهِ ﷺ مَنْ صَلَّى فَلْيُصَلِّ مَثْنَى مَثْنَى فَإِنْ أَحَسَّ أَنْ يُصْبِحَ سَجَدَ سَجْدَةً فَأَوْتَرَتْ لَهُ مَا صَلَّى قَالَ أَبُو كُرَيْبٍ عُبَيْدُ اللَّهِ بْنُ عَبْدِ اللَّهِ وَلَمْ يَقُلِ ابْنِ عُمَرَ