Regarding Whoever Rejects Even Just one of the Imams عليهم السلام

Saʿd b. ʿAbd Allāh, from Muḥammad b. ʿĪsā, from Ismāʿīl b. Mihrān from Muḥammad b. Saʿīd, from Abān b. Taghlib, who narrated: “I said to Abī ʿAbd Allāh عليه السلام: “Whoever recognises the Imams, but has not recognised the Imam of his own time—is he a believer?” He said: “No.” I asked: “Is he a Muslim?,” to which he replied: “A Muslim.”