Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) prayed three rak'ahs of witr and recited the qunut in them before the bowing.
Only Ata bin Muslim narrated this, and he is da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4866
Hadith Gradingمحدثین:صحيح لغيره
Hadith Takhrij«صحيح لغيره۔ اخرجه ابو نعيم في الحليه 5/62»