This is an authentic hadith.

2424 – Maḥmūd ibn Ghaylān narrated to us, Abū Dāwūd narrated to us, from Shuʿbah, from Qatādah, who heard Anas, from ʿUbādah ibn al-Ṣāmit, that the Prophet ﷺ said: "The dream of the believer is one part of forty-six parts of prophethood."(1)

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= (7642), and "Ṣaḥīḥ Ibn Ḥibbān" (6040).
It will also come under numbers (2433) and (2444).

His saying: "And the most beloved of fetters..." – this is an insertion (mudraj) from the saying of Abū Hurayrah. Al-Khaṭīb said in "Al-Faṣl lil-Waṣl al-Mudraj fī al-Naql" 1/170: All of this text is the saying of the Messenger of Allah ﷺ except for the mention of the fetter and the chain, for it is from the saying of Abū Hurayrah, which these narrators inserted into the hadith, and Maʿmar ibn Rāshid clarified it in his narration from Ayyūb, from Muḥammad ibn Sīrīn. We say: It is found in Muslim (2263), Aḥmad (7642), al-Khaṭīb 1/171, al-Baghawī in "Sharḥ al-Sunnah" (3279), and it will come under the author's number (2444). Ibn Ḥibbān also narrated it in his "Ṣaḥīḥ" (6040) via the route of Sufyān, from Ayyūb, from him. And see "Fatḥ al-Bārī" 12/410.

(1) Its chain is authentic. It was also narrated by al-Bukhārī (6987), Muslim (2264), Abū Dāwūd (5018), and al-Nasāʾī (7625). It is in "Al-Musnad" (22697).

Al-Baghawī said in "Sharḥ al-Sunnah" 12/203–204: His saying: "a part of prophethood" – he intended to affirm the matter of the dream and emphasize it. It is only a part of prophethood with respect to the prophets, not others. ʿUbayd ibn ʿUmayr said: The dreams of the prophets are revelation. And he recited: {Indeed, I see in a dream that I am slaughtering you, so see what you think. He said: O my father, do what you are commanded} [Al-Ṣāffāt: 102].

And it is said: Its meaning is that it is a part of the parts of prophetic knowledge, and prophetic knowledge remains, while prophethood does not remain. Or he meant by it that it is like prophethood in being judged as sound, just as he, peace and blessings be upon him, said: "Righteous guidance, good conduct, and moderation are a part of twenty-five parts of =