I sought permission for myself and al-Husayn b. Qayama to meet al-Ridha عليه السلام in Surya, he granted it and said: finish all your needs [ask all your questions]. al-Husayn (b. Qayama) said to him: is the earth ever devoid of an Imam? He عليه السلام said: no, he (al-Husayn) said: does it ever happen that there are two Imams (together)? He عليه السلام said: no, except if one is silent and not talking, he (al-Husayn) said: I have come to know that you are not an Imam! He عليه السلام said: and how did you come to know that? he (al-Husayn) said: you do not have a son and it [Imama] is through posterity [lineal descendants], so he عليه السلام said: by Allah, the days and the nights will not pass except a son will be born to me from my loins who will assume the position I have, he will enliven the truth and efface the falsehood.