Allah will never unite the community of Muhammad (peace and blessings be upon him) upon misguidance

It is narrated from Sayyiduna Abu Mas'ud al-Ansari (may Allah be pleased with him); Abu al-Sha'tha' says: We went out with him and said to him: Give us some counsel. He said: Hold fast to the fear of Allah (taqwa) and to adherence to the community of Muhammad (peace and blessings be upon him), for Allah Almighty will never unite the community of Muhammad (peace and blessings be upon him) upon misguidance. And indeed the religion of Allah is one, so beware of changing colours (being fickle) in the religion of Allah. Adopt taqwa, and be patient until a righteous man finds rest (through death) or rest is found from a wicked man (through his destruction).
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it. And we have also recorded it as a musnad (marfu') report through a chain that is not sound according to the condition of this book:

It is narrated from Sayyiduna Qudamah bin Abdullah bin Ammar al-Kilabi (may Allah be pleased with him) that he said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Hold fast to the fear of Allah and to adherence to the community, for Allah will not unite this Ummah upon misguidance. And be patient until a righteous servant finds rest (by departing this world) or rest is found from a wicked man (by the ending of his evil)."
We have recorded this hadith with this chain only from this shaykh, and the burden of it lies on al-Husayn bin Dawud, for according to us only one hadith is soundly established with this chain.

It is narrated from Sayyiduna Qudamah bin Abdullah bin Ammar al-Kilabi (may Allah be pleased with him) that he said: I saw the Messenger of Allah (peace and blessings be upon him) stoning the Jamrah on the Day of Sacrifice (the day of Eid al-Adha). No one was being beaten there, no one was being pushed out of the way, and there was no shouting of "Out of the way, out of the way."
This hadith has several routes of transmission from Ayman bin Nabil, and Imam Bukhari (may Allah have mercy on him) used Ayman bin Nabil as evidence in his al-Jami' al-Sahih.