Verse 29, of Sura 48 reads {48:29}: "Muhammad is the Apostle of God and those with him are firm against the disbelievers, and merciful amongst themselves. Thus see them bowing down, and prostrating themselves in prayer, seeking grace from Allah and His pleasure. Their mark is upon their faces, being the traces of prostration. Such is their description in the Torah. And their description in the Gospel is like a seed that sends forth its sprout, then makes it strong; it then becomes thick, and stands on its stem, delighting the sowers, and causing the disbelievers to burn with rage at the sight of them. Allah has promised to those of them who believe and do good works, forgiveness and a great reward."
According to the commentary of Imam Abu Musa this verse was revealed in favor of Ali.