Imam Muhammad Baqir (a.s.) is quoted in Basairud Darajat through authentic narrations that the Prophet of Allah is ‘Munzir’ (warner) and that, after him, there is a guide from us for every period that guides the people to those things, which the Prophet (S) has brought from Allah. After the Holy Prophet (S) the first ‘Hadi’ is Ali (a.s.) and after him, the holy Imams will, one after another, be guiding people until Qiyamat.