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:2836 – ʿAbd al-Ṣamad > Hammām > Qatādah > Abū Mijlaz > Saʾalt Ibn ʿAbbās > al-Watr

I asked Ibn 'Abbas about the Witr prayer. He said: I heard the Messenger of Allah ﷺ as saying: It is a rak'ah at the end of the night prayer. (Using translation from Muslim 753)  

أحمد:٢٨٣٦ – حَدَّثَنَا عَبْدُ الصَّمَدِ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا قَتَادَةُ عَنْ أَبِي مِجْلَزٍ قَالَ سَأَلْتُ ابْنَ عَبَّاسٍ عَنِ الْوَتْرِ فَقَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ وَسَأَلْتُ ابْنَ عُمَرَ فَقَالَ سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ  

See similar narrations below:

Collected by Muslim, Aḥmad
muslim:753 – Zuhayr b. Ḥarb > ʿAbd al-Ṣamad > Hammām > Qatādah > Abū Mijlaz > Saʾalt Ibn ʿAbbās > al-Witr

I asked Ibn 'Abbas about the Witr prayer. He said: I heard the Messenger of Allah ﷺ as saying: It is a rak'ah at the end of the night prayer.  

مسلم:٧٥٣ – وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ حَدَّثَنَا عَبْدُ الصَّمَدِ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا قَتَادَةُ عَنْ أَبِي مِجْلَزٍ قَالَ سَأَلْتُ ابْنَ عَبَّاسٍ عَنِ الْوِتْرِ فَقَالَ

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ وَسَأَلْتُ ابْنَ عُمَرَ فَقَالَ سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ  

ahmad:3408 – Bahz > Hammām > Qatādah Wḥaddathanā ʿAffān > Hammām > Qatādah > ʿAffān > Qatādah > Abū Mijlaz > Saʾalt Ibn ʿUmar > al-Watr

[Machine] I heard the Messenger of Allah ﷺ say, "A prayer (rak'ah) in the last part of the night." I asked Abdullah ibn Abbas, and he said, "I heard the Messenger of Allah ﷺ say, 'A prayer (rak'ah) in the last part of the night.'"  

أحمد:٣٤٠٨ – حَدَّثَنَا بَهْزٌ حَدَّثَنَا هَمَّامٌ عَنْ قَتَادَةَ وحَدَّثَنَا عَفَّانُ قَالَ حَدَّثَنَا هَمَّامٌ عَنْ قَتَادَةَ قَالَ عَفَّانُ أَخْبَرَنَا قَتَادَةُ عَنْ أَبِي مِجْلَزٍ قَالَ سَأَلْتُ ابْنَ عُمَرَ عَنِ الْوَتْرِ فَقَالَ

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ قَالَ وَسَأَلْتُ عَبْدَ اللهِ بْنَ عَبَّاسٍ فَقَالَ سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ رَكْعَةٌ مِنْ آخِرِ اللَّيْلِ