That Anas ibn Malik was asked: "Did the Messenger of Allah ﷺ recite the qunūt in the morning prayer?" He said: "Yes." It was said to him: "Before the bowing or after it?" He said: "After the bowing." (1)

1072 - Ismāʿīl ibn Masʿūd informed us, saying: Bishr ibn al-Mufaḍḍal narrated to us, from Yūnus, from Ibn Sīrīn, who said:
Some of those who prayed the morning prayer with the Messenger of Allah ﷺ narrated to me that when he said: "Allah hears the one who praises Him" in the second rakʿah, he stood for a little while. (2)

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(1) Its chain of transmission is authentic. Qutaybah: he is Ibn Saʿīd, and Ḥammād: he is Ibn Zayd, and Ayyūb: he is Ibn Abī Tamīmah al-Sakhtiyānī, and Ibn Sīrīn: he is Muḥammad. It is found in "Al-Sunan al-Kubrā" under number (662).
It was also recorded by al-Bukhārī (1001), Abū Dāwūd (1444) via two routes from Ḥammād ibn Zayd, with this chain of transmission. In al-Bukhārī's version: "after the bowing, briefly," and similarly in a narration of Abū Dāwūd. Al-Ḥāfiẓ Ibn Ḥajar said in "Al-Fatḥ" 2/490: ʿĀṣim clarified the extent of this brevity in his narration, where he said: "He only recited the qunūt after the bowing for a month."
It was also recorded by Aḥmad (12117), Muslim (677): (298), and Ibn Mājah (1184) via two routes from Ayyūb, with it.
And it was recorded by Aḥmad (12698) and (13185) via the route of Khālid al-Ḥadhdhāʾ, from Muḥammad ibn Sīrīn: "I asked Anas ibn Mālik: Did ʿUmar recite the qunūt?" He said: "Yes, and one better than ʿUmar — the Messenger of Allah ﷺ — after the bowing."
It has preceded before this via the route of Abū Mijlaz, from Anas.

(2) Its chain of transmission is authentic. Yūnus: he is Ibn ʿUbayd, and Ibn Sīrīn: he is Muḥammad. It is found in "Al-Sunan al-Kubrā" under number (663).
The Companion of the ḥadīth is Anas ibn Mālik, as will be mentioned, and it was alluded to in "Al-Tahdhīb," and al-Ḥāfiẓ Ibn Ḥajar affirmed it in "Taqrīb al-Tahdhīb" regarding the unnamed narrators.
It was also recorded by Abū Dāwūd (1446) from Musaddad, and al-Dāraquṭnī in "Al-Sunan" (1686), and in "Al-ʿIlal" 6/209–210 via the route of Nuʿaym ibn al-Hayṣam Abū Muḥammad al-Harawī, both from Bishr ibn al-Mufaḍḍal, with this chain of transmission. Both Musaddad and Nuʿaym are trustworthy. =