Musnad Ahmad 1101:9

Hashim ibn al-Qasim narrated to us, al-Faraj narrated to us, Sulayman ibn Sulaym narrated to us, he said: Al-Miqdad ibn al-Aswad said: "I do not say anything good or evil about a man until I see what he ends with," meaning after something I heard from the Prophet, may God bless him and grant him peace. It was said: "And what did you hear?" He said: "I heard the Messenger of God, may God bless him and grant him peace, say: 'The heart of the son of Adam is more prone to overturning than a cooking pot when it has gathered to a boil.'"