21-6 Muhammad ibn Musa ibn al-Mutevakil - may God be pleased with him - narrated that Muhammad ibn Aba Abdullah al-Kufy quoted Musa ibn Imran al-Nakha’ee, on the authority of his uncle Al-Hussein ibn Yazid al-Nawfaly, on the authority of Ali ibn Hamzih, on the authority of Abi Basir,

“I asked Aba Abdullah as-Sadiq (MGB) about the meaning of ‘the prescribed period in the following words of the Honorable the Exalted God, ‘(He wants you) to complete the prescribed period… ’’ The Imam (MGB) replied, ‘Thirty days.’”