On the authority of Anas, that he was asked: "Did the Prophet, peace and blessings be upon him, perform the qunut in the morning prayer?" He said: "Yes." It was said to him: "Before the bowing or after the bowing?" He said: "After the bowing." Musaddad said: "For a short while."(1)

1445 - Abu al-Walid al-Tayalisi narrated to us, Hammad ibn Salama narrated to us, on the authority of Anas ibn Sirin, on the authority of Anas ibn Malik: that the Prophet, peace and blessings be upon him, performed the qunut for a month, then abandoned it.(2)

--------------------------------------------
(1) Its chain of transmission is authentic. Musaddad: he is Ibn Musarhad, and Hammad: he is Ibn Zayd, and Ayyub: he is Ibn Abi Tamima al-Sakhtiyani, and Muhammad: he is Ibn Sirin.
It was also recorded by al-Bukhari (1001), Muslim (677), Ibn Majah (1184), and al-Nasa'i in "al-Kubra" (662) through multiple chains from Ayyub al-Sakhtiyani, with this chain of transmission.
It is in "Musnad Ahmad" (12117).
Muslim (677) recorded through the path of Abu Majlaz, on the authority of Anas, who said: The Messenger of Allah, peace and blessings be upon him, performed the qunut for a month after the bowing in the morning prayer, supplicating against Ri'l and Dhakwan, and saying: "Usayya disobeyed Allah and His Messenger."
Ibn Majah (1183) recorded through the path of Humayd al-Tawil, on the authority of Anas, who said: He was asked about the qunut in the morning prayer, and he said: "We used to perform the qunut before the bowing and after it." Its chain of transmission is authentic. And see what follows it, and what will come under number (1446).

(2) Its chain of transmission is authentic. Abu al-Walid al-Tayalisi: he is Hisham ibn Abd al-Malik.
It was also recorded by Muslim (677) through the path of Bahz ibn Asad, from Hammad ibn Salama, with it, with the wording: that the Messenger of Allah, peace and blessings be upon him, performed the qunut for a month after the bowing in the dawn prayer, supplicating against the Banu Usayya. And he did not say in his narration: "then he abandoned it."
It was also recorded by Muslim (677) and al-Nasa'i in "al-Kubra" (668) and (670) through the path of Qatada, on the authority of Anas: that the Messenger of Allah, peace and blessings be upon him, performed the qunut for a month, supplicating against certain tribes of the Arabs, then he abandoned it. Al-Nasa'i added: "after the bowing."