Musnad Ahmad 33:480

Abdullah ibn al-Harith al-Makhzumi narrated to us, from Ibn Jurayj, Abu al-Zubayr informed me that he heard Jabir ibn Abdullah saying: I heard the Prophet, peace and blessings of Allah be upon him, saying: "Hardness of hearts and coarseness are in the people of the East, and faith is in the people of the Hijaz."