I asked Anas whether the Messenger of Allah (ﷺ) observed Qunut in the dawn prayer. He said: Yes, (he did so) after the ruku', for a short while.
Sahih Muslim Book 5, Hadith 379
← Previous Hadith Allah the Exalted and Great revealed (a verse) regarding those who were killed at Bi'r Ma'una, and we recited it, till it was abrogated later on (and the verse was like this):, convey to it our people the tidings that we have met our Lord, and He was pleased with us and we were pleased with Him".

Sahih Muslim Book 5, Hadith 378 Next Hadith → The Messenger of Allah (ﷺ) observed Qunut for a month in the dawn prayer after ruku' and invoked curse upon Ri'l, Dhakwan, and said that 'Usayya had disobeyed Allah and His Apostle (ﷺ).

Sahih Muslim Book 5, Hadith 380