Da'if Ahadith

(Abu Barzah (may Allah be pleased with him) narrates that we were with the Prophet (peace be upon him) when he heard the sound of singing, so he said, "See what this is?" Upon this, I climbed up and saw that Muawiyah and Amr bin Al-As were singing. I informed the Prophet (peace be upon him) of this, so he prayed against them, saying:) "O Allah! Put them in trial and push them into the Fire."