his father said: I heard Messenger of Allah saying: "There are no two Witr in one night."  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ وِتْرَانِ فِي لَيْلَةٍ  

"The Prophet would pray two Rak'ah after Al-Witr."  

أَنَّ النَّبِيَّ ﷺ كَانَ يُصَلِّي بَعْدَ الْوِتْرِ رَكْعَتَيْنِ