Claims of the Bab

The hostility aroused by the claim of Bábhood (deputyship of Mahdi) was redoubled when the young reformer proceeded to declare that He was Himself the Mihdí (Mahdi) Whose coming Muḥammad had foretold. The Shí’ihs identified this Mihdí with the 12th Imám who, according to their beliefs, had mysteriously disappeared from the sight of men about a thousand years previously. They believed that he was still alive and would reappear in the same body as before, and they interpreted in a material sense the prophecies regarding his dominion, his glory, his conquests...

The Bábís, on the other hand, interpreted many of the prophecies figuratively. They regarded the sovereignty of the Promised One, like that of the Galilean “Man of Sorrows,” as a mystical sovereignty; His glory as spiritual, not earthly glory; His conquests as conquests over the cities of men’s hearts’...

But the Báb did not stop even with the claim of Mihdíhood. He adopted the sacred title of “Nuqṭiyiúlá” or “Primal Point.” This was a title applied to Muḥammad Himself by His followers. Even the Imáms were secondary in importance to the “Point,” from Whom they derived their inspiration and authority. In assuming this title, the Báb claimed to rank, like Muḥammad, in the series of great Founders of Religion, and for this reason, in the eyes of the Shí’ihs, He was regarded as an impostor.

(Bahá’u’lláh and the New Era, J. E. Esslemont, US Bahá’í Publishing Trust, 1980 edition Page 286)

https://reference.bahai.org/en/t/je/BNE/bne-18.html