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
suyuti:2162a –

Messenger of Allah said: "When Fajr begins, then every Salat of the night and Al-Witr have gone, so perform Al-Witr before Fajr begins." (Using translation from Tirmidhī 469)   

السيوطي:٢١٦٢a –

"إذا طَلَعَ الفجْرُ فَقَدْ ذَهَبَ كُلُّ صلاة اللَّيلِ والوتْرُ، فأوْترُوا قَبْلَ طُلوع الْفَجْرِ".  

[عب] عبد الرازق [ت] الترمذي ومحمد بن نصر عن ابن عمر

See similar narrations below:

Collected by Tirmidhī
tirmidhi:469 – Maḥmūd b. Ghaylān > ʿAbd al-Razzāq > Ibn Jurayj > Sulaymān b. Mūsá > Nāfiʿ > Ibn ʿUmar

Messenger of Allah said: "When Fajr begins, then every Salat of the night and Al-Witr have gone, so perform Al-Witr before Fajr begins."  

الترمذي:٤٦٩ – حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ أَخْبَرَنَا ابْنُ جُرَيْجٍ عَنْ سُلَيْمَانَ بْنِ مُوسَى عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ

عَنِ النَّبِيِّ ﷺ قَالَ إِذَا طَلَعَ الْفَجْرُ فَقَدْ ذَهَبَ كُلُّ صَلاَةِ اللَّيْلِ وَالْوِتْرُ فَأَوْتِرُوا قَبْلَ طُلُوعِ الْفَجْرِ  

قَالَ أَبُو عِيسَى وَسُلَيْمَانُ بْنُ مُوسَى قَدْ تَفَرَّدَ بِهِ عَلَى هَذَا اللَّفْظِ وَرُوِيَ عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ لاَ وِتْرَ بَعْدَ صَلاَةِ الصُّبْحِ وَهُوَ قَوْلُ غَيْرِ وَاحِدٍ مِنْ أَهْلِ الْعِلْمِ وَبِهِ يَقُولُ الشَّافِعِيُّ وَأَحْمَدُ وَإِسْحَاقُ لاَ يَرَوْنَ الْوِتْرَ بَعْدَ صَلاَةِ الصُّبْحِ