“I asked abu Ja’far (a.s.), ‘Is there a definite time for this matter (the rise of al-Mahdi with Divine Authority)?” He said, “Those who set a definite time have lied, those who set a definite time have lied, those who set a definite time have lied. When Musa (Moses) came out to delegate before his lord and gave the people a definite time for his return and Allah added an other ten days his people said, ‘He has broken his promise.’” They then did what they did. When we say a hadith (make a statement to you) and if our hadith comes true you should say, “Allah has spoken the truth.” If we say a hadith to you ( make a statement) and if doe not come true, you should say, “Allah has spoken the truth.” You will be rewarded twice.”