The Messenger of Allah ﷺ used to pray witr with "Glorify the name of your Lord, the Most High," "Say, O disbelievers," and "Say, He is Allah, the One."
حدثنا عبد الله حدثنا عثمان بن أبي شيبة حدثنا أبو حفص الأبار عن الأعمش عن طلحة وزبيد عن ذر عن سعيد بن عبد الرحمن بن أبزي عن أبيه
أن رسول الله ﷺ كان يوتر بسبح اسم ربك الأعلى وقل يا أيها الكافرون وقل هو الله أحد
Its isnad is sahih. Abu Hafs Abbar is Umar bin Abdul-Rahman, and he is trustworthy and a haafiz. Buraid is Ibn Harith Yami, and he is trustworthy and a haafiz. Dhirr bin Abdullah is likewise, and he was among the devout worshippers, and his hadith is found in the collections of the group. The hadith has preceded at 15302 and 15298.