One who agrees upon the oneness and distinctiveness of God should announce the guardianship of twelve infallible Imams AS as well. While pointing to the “Silsila tul Zahab” narration, he said that, this narration refers to the saying of God by the speech of Imam Reza A.S; according to the text of this narration, guardianship of infallible Imams is a pre requisite of belief in the oneness of God.
source : http://shabestan.net
