It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When you see my Ummah unable to say to the wrongdoer, 'You are a wrongdoer,' then they have been abandoned (left to themselves)."
This Muhammad bin Muslim is Abu al-Zubayr, and he did not hear from Abdullah bin Amr bin al-As.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الغصب / 11516