I said to him: I am fearful because of the supplication of Abi Abdillah عليه السلام against Yaqtin and his off-spring, so he [the Imam] said: O Aba al-Hasan [Ali b. Yaqtin] it is not as you think, verily the believer who arises from the back-bone [lineage] of a disbeliever is like the stone in a clay brick, when rain comes it washes away the clay [dissolves it to mud] but does not harm the stone in any way.