...from his father, that the Messenger of Allah ﷺ used to pray witr with "Glorify the name of your Lord, the Most High" [Ala 87:1], "Say, disbelievers" [Kafirun 109:1], and "Say, He is Allah, the One" [Ikhlas 112:1]. When he gave the closing salutation he would say, "Glory be to the King, the Most Holy," three times, raising his voice on the third.
ى، عن أبيه، أن رسول الله ﷺ كان يوتر ب {سبح اسم ربك الأعلى} و {قل يأيها الكفرون} و {قل هو الله أحد} وكان يقول إذا سلم: سبحان الملك القدوس ثلاثا ويرفع صوته بالثالثة.
Nasai (1732) narrated it from Amr bin Yazid, who said, Bahz bin Assad narrated to us, who said, Shuba narrated to us, from Salama and Zubayd, from Zurr, from Ibn Abdul-Rahman bin Abza, and he related it. Zurr is Ibn Abdullah Marhabi Hamdani, and Ibn Abdul-Rahman bin Abza's name is Saeed, and he is trustworthy. Nasai also narrated it through several routes from Zurr, and Abdul-Razzaq (4697) and Imam Ahmad (15354) both narrated it likewise through the route of Zurr. Its chain is sahih, and Abdul-Rahman bin Abza Khuzai, their freed client, is a companion. Abu Hatim said, He met the Prophet ﷺ and prayed behind him.Baghawi said, Ibn Abza is Saeed bin Abdul-Rahman bin Abza, who narrates from his father Abdul-Rahman. This is also narrated from Abdul-Rahman bin Abza, from Ubayy bin Kaab, from the Prophet ﷺ, Sharh al-Sunnah (4/98).I say, it appears from this that Abdul-Rahman bin Abza used to narrate first from Ubayy bin Kaab, then he came to have direct knowledge of the hadith from the action of the Messenger of Allah ﷺ himself, since he was a companion, as confirmed by Bukhari, Tirmidhi, Abu Hatim, and others. So he began narrating it without mentioning Ubayy bin Kaab. The hadith is thus part of his own musnad and part of the musnad of Ubayy bin Kaab, and there is no need to declare either route mistaken.