Kitab-i-Iqan — Paragraph 71

Likewise, ere the beauty of Muhammad was unveiled, the signs of the visible heaven were made manifest. As to the signs of the invisible heaven, there appeared four men who successively announced unto the people the joyful tidings of the rise of that divine Luminary. Rúz-bih, later named Salmán, was honoured by being in their service. As the end of one of these approached, he would send Rúz-bih unto the other, until the fourth who, feeling his death to be nigh, addressed Rúz-bih saying: “O Rúz-bih! when thou hast taken up my body and buried it, go to Hijáz for there the Day-star of Muhammad will arise. Happy art thou, for thou shalt behold His face!”