Musnad Ahmad 33:443

Yahya ibn Adam narrated to us, Abu 'Awanah narrated to us, from Abu Bishr, from Sulayman, from Jabir, from the Prophet, may Allah bless him and grant him peace, that he said: "Faith is in the people of the Hijaz, and harshness of hearts and coarseness are in the loud-voiced ones, among the people of the East."