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
tabarani:9421 – ʿAlī b. ʿAbd al-ʿAzīz > Ḥajjāj b. al-Minhāl > Ḥammād b. Salamah > al-Ḥajjāj > al-Aʿmash > ʿUmārah b. ʿUmayr > ʿAbd al-Raḥman b. Yazīd > Ibn Masʿūd

[Machine] "Witr is three units of prayer, similar to the prayer of Maghrib."  

الطبراني:٩٤٢١ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثنا حَجَّاجُ بْنُ الْمِنْهَالِ ثنا حَمَّادُ بْنُ سَلَمَةَ عَنِ الْحَجَّاجِ عَنِ الْأَعْمَشِ عَنْ عُمَارَةَ بْنِ عُمَيْرٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ عَنِ ابْنِ مَسْعُودٍ قَالَ

«الْوِتْرُ ثَلَاثُ رَكَعَاتٍ كَصَلَاةِ الْمَغْرِبِ»  

See similar narrations below:

Collected by Ṭabarānī
tabarani:9420 – Muḥammad b. al-Naḍr al-Azdī > Muʿāwiyah b. ʿAmr > Zāʾidah > al-Aʿmash > Mālik b. al-Ḥārith > ʿAbd al-Raḥman b. Yazīd > ʿAbdullāh

[Machine] "The Witr prayer is three, like the Witr of the daytime prayer."  

الطبراني:٩٤٢٠ – حَدَّثَنَا مُحَمَّدُ بْنُ النَّضْرِ الْأَزْدِيُّ ثنا مُعَاوِيَةُ بْنُ عَمْرٍو ثنا زَائِدَةُ عَنِ الْأَعْمَشِ عَنْ مَالِكِ بْنِ الْحَارِثِ عَنْ عَبْدِ الرَّحْمَنِ بْنِ يَزِيدَ عَنْ عَبْدِ اللهِ قَالَ

«الْوِتْرُ ثَلَاثٌ كَوِتْرِ النَّهَارِ صَلَاةِ الْمَغْرِبِ»