It is narrated from Imam Sadiq (a.s.): Abdullah ibn Yahya came to Imam Ali (a.s.) and said: “O Commander of the Faithful! If you want to benefit me and teach me; tell me the sin for which I was afflicted in this assembly so that I may not return to it.” He said: “It was that you did not say Bismillah, the Most Gracious, the Most Merciful, when sitting, and God made you so rude and neglect your duty that this calamity and affliction of yours purified you. Did you not know that the Messenger of God (s.a.w.s.) said to me on behalf of God Almighty: “Any important work in which Bismillah is not mentioned, its end should be cut off.” I said: “My parents are your sacrifices! From now on, I will not be concerned about it.” He said: “In that case, you will benefit from it and be happy.” Abdullah ibn Yahya said: “O Commander of the Faithful! What is the interpretation of Bismillah, the Most Gracious, the Most Merciful?” He said: “Whenever a servant intends to recite or perform an action, he says: Bismillah, the Most Gracious, the Most Merciful, meaning: [In this name, I perform this deed]. So, whatever action he performs, he should begin with [Bismillah, the Most Gracious, the Most Merciful]. Indeed, there is a blessing and a blessing for him in it.”