Kitab-i-Iqan — Paragraph 223

With unswerving vision, with pure heart, and sanctified spirit, consider attentively what God hath established as the testimony of guidance for His people in His Book, which is recognized as authentic by both the high and lowly. To this testimony we both, as well as all the peoples of the world, must cling, that through its light we may know and distinguish between truth and falsehood, guidance and error. Inasmuch as Muhammad hath confined His testimonies to His Book and to His Family, and whereas the latter hath passed away, there remaineth His Book only as His one testimony amongst the people.