4-69 Muhammad ibn al-Hassan ibn Ahmad ibn al-Walid - may God be pleased with him - narrated that Muhammad ibn al-Hassan al-Saffar quoted Yaqoob ibn Yazid, on the authority of Muhammad ibn Sin’an who linked it up through a chain of narrators to Aba Abdullah as-Sadiq (MGB), “God has received a pledge from the believer so that his speech doesn’t become accepted, they do not believe his narration, he doesn’t take revenge from his enemy unless he divulges himself because every believer is silent.”