Allah the Exalted said:
٢٢ - باب في النصيحة
Allah the Exalted said:
The believers are but brothers, so make settlement between your brothers. And fear Allāh that you may receive mercy.
And Allah the Exalted said, relating about Nūḥ (peace be upon him):
I convey to you the messages of my Lord and advise you; and I know from Allāh what you do not know.
And about Hūd (peace be upon him):
I convey to you the messages of my Lord, and I am to you a trustworthy adviser.
As for the hadiths:
The first: On the authority of Abū Ruqayyah Tamīm ibn Aws al-Dārī (may Allah be pleased with him): that the Prophet ﷺ said: «The religion is sincere counsel.» We said: To whom? He said: «To Allah, to His Book, to His Messenger, to the leaders of the Muslims, and to their common folk.» Narrated by Muslim.
The second: On the authority of Jarīr ibn ʿAbd Allāh (may Allah be pleased with him), who said: I pledged allegiance to the Messenger of Allah ﷺ upon establishing the prayer, giving the zakāh, and offering sincere counsel to every Muslim. Agreed upon.
The third: On the authority of Anas (may Allah be pleased with him), from the Prophet ﷺ, who said: «None of you truly believes until he loves for his brother what he loves for himself.» Agreed upon.