Pearl of Wisdom
'The earth will never be absent of having an Imam, so that if the believers were to add something [to religion] he would refute it, and if they were to omit something from it, he would complete it for them [by bringing it back].'
Imam Ja'far ibn Muhammad al-Sadiq [as]
Ibid. v. 1, p. 178, no. 2
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