On the authority of Samurah ibn Jundub, who said: The Messenger of Allah (peace and blessings be upon him) commanded us to greet our leaders with salām, and that we greet one another with salām. (1)

31 - Chapter: The Imām Should Not Single Himself Out with Supplication

923 - Muhammad ibn al-Muṣaffā al-Ḥimṣī narrated to us, Baqiyyah ibn al-Walīd narrated to us, from Ḥabīb ibn Ṣāliḥ, from Yazīd ibn Shuraīḥ, from Abū Ḥayy al-Mu'adhdhin, from Thawbān, who said: The Messenger of Allah (peace and blessings be upon him) said: "No servant leads the prayer and singles himself out with a supplication to the exclusion of them [the congregation]; for if he does so, he has betrayed them." (2)

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(1) Its chain of transmission is weak; al-Ḥasan al-Baṣrī is a mudallis and narrated it with ʿanʿanah [ambiguous "on the authority of" phrasing]. Hammām: he is Ibn Yaḥyā al-ʿAwdhī al-Baṣrī, and Qatādah: he is Ibn Diʿāmah al-Sadūsī.
It was also recorded by Ibn Khuzaymah (1710) and al-Bayhaqī 2/181 via the path of ʿAbd al-Aʿlā ibn al-Qāsim, with this chain. The word "our leaders" (a'immatinā) in the printed edition of "Ṣaḥīḥ Ibn Khuzaymah" was corrupted to "our oaths" (aymāninā).
See also what precedes it.

(2) Yazīd ibn Shuraīḥ: a group narrated from him, and no attestation of his reliability is known from anyone other than Ibn Ḥibbān. Al-Dāraquṭnī said: He is taken into consideration. The rest of the narrators in this chain are trustworthy, except Muhammad ibn al-Muṣaffā, who is ṣadūq [truthful], and Baqiyyah, who is weak and a mudallis, and he narrated it with ʿanʿanah; however, he has a corroborating narrator.
It was also recorded by Abū Dāwūd (90) and al-Tirmidhī (357) via the path of Ismāʿīl ibn ʿAyyāsh, from Ḥabīb ibn Ṣāliḥ, with this chain. Al-Tirmidhī said: A ḥasan ḥadīth.
It was also recorded by Abū Dāwūd (91) via the path of Thawr ibn Yazīd, from Yazīd ibn Shuraīḥ, from Abū Ḥayy al-Mu'adhdhin, from Abū Hurayrah, thus making it a ḥadīth of Abū Hurayrah. Al-Tirmidhī said: It is as though the ḥadīth of Yazīd ibn Shuraīḥ, from Abū Ḥayy al-Mu'adhdhin, from Abū Hurayrah is sounder in chain and more well-known.
It is in the "Musnad of Aḥmad" (22415), and see also (22152), for therein is a detailed account of the discrepancy in its chain.