Hadith.5552 - Ibn Abi Umayr narrated from Ammar ibn Marwan, who said: "I said to Abu Abdullah عليه السلام: 'My father was on his deathbed, and I said to him, "Make a will." He (my father) said, "This is my son," referring to Umar, "whatever he does is valid."' Abu Abdullah عليه السلام, said: "Your father has indeed made a will and done so concisely." I said: 'He also instructed and willed to give you such and such.' Imam عليه السلام said: "Approve it." I said: 'He made a bequest to free a believing and knowledgeable soul, but when we emancipated her, it became evident that she was not of proper lineage.' Imam عليه السلام said: "It has fulfilled his obligation. The example of this is like a man who buys a sacrificial animal thinking it is fat, but then finds it to be thin. It still suffices for him."