12-69 Muhammad ibn Musa ibn al-Mutevakil - may God be pleased with him - narrated that Ali ibn al-Hussein al-Sa’ed Abady quoted Ahmad ibn Aba Abdullah al-Barqy, on the authority of his father and others, on the authority of Muhammad ibn Suleiman al-Sin’ani, on the authority of Ibrahim ibn al-Fazl, on the authority of Aban ibn Taqlib, “I was with Aba Abdullah as-Sadiq (MGB) when some of the people from Yemen came to see the Imam (MGB). They greeted him (MGB) and he (MGB) greeted them back and said, ‘O Sa’d. You are welcome.’That man said, "This is the name which my mother named me. Few people know me by this name.” The Imam (MGB) said, "O’ Sa’d! O’ Mula! You have told the truth.” That man said, “May I be Your ransom! That is my nickname.” The Imam (MGB) said, "That is not a good nickname. In fact, the Blessed the Sublime God has said in His Book ‘Nor call each other by (offensive) nicknames: Ill-seeming is a name connoting wickedness, (to be used of one) after he has believed.’ A bad name is not suitable for a believer. O Sa’d! What is your job?” He (MGB) replied, “We are a family of astrologers. No one is more knowledgeable in astrology than we are in Yemen.” The Imam (MGB) said, "Can I ask you some questions about astrology from you (MGB).” He replied, “Yes. Ask whatever you wish to ask and I will give you a scientific answer.” The Imam (MGB) asked, "How much more is the brightness of the Sun than that of the moon?" He said, "I do not know." He (MGB) said, "You have told the truth.” Then the Imam (MGB) asked, "How much more is the brightness of the moon than that of Venus?” He said, "I do not know". He (MGB) asked, "What is the name of astar which arouses lust in the cows when it rises to shine? He said, "I do not know?" He asked, "How much more is the light of Jupiter than that of Mercury?" He said, "I do not know.” He (MGB) asked, "What is the name of the star that the camels copulate when it is seen?" He said, "I do not know." He (MGB) asked, "What is the name of the star that the dogs copulate when it is seen?" He said, "I do not know." He (MGB) asked, "What is your opinion about Saturn?" He said, "It is a star that brings bad luck" He (MGB) said, "Do not say so because that is Ali’s (MGB) star. It is the star of the Trustees. That is the shooting star about which the Blessed the Sublime God has said, ‘And what will explain to thee what the Night-Visitant is? (It is) the Star of piercing brightness.’ The man from Yemen asked, “What does Night-Visitant mean?” He (MGB) said, "It rises from the seventh heaven and illuminates all the heavens with its light. For this very reason, the Honorable the Exalted God named it Night-Visitant. O the man from Yemen! Do you have any scholars in Yemen?” He said, "Yes. May I be your ransom! There are some scholars who have no match in knowledge anywhere.” The Imam (MGB) said, "How knowledgeable are they?” He said, "They can tell fortune with birds. They can tell about the location of the steps of a fast rider one month away in an hour.” The Imam (MGB) said, "Indeed the knowledgeable people of Medina are more knowledgeable than those of Yemen.” He asked, “How knowledgeable are the scholars of Medina?” The Imam (MGB) said, “The knowledge of the scholars of Medina is so extensive that the knowledge of the scholars in Yemen and fortune-telling with birds can never reach it. They can traverse in a single moment the distance of the path of the rays of the Sun that equals twelve stars, twelve deserts, twelve seas and twelve worlds.” The man from Yemen said, “May I be your ransom! I do not think that anyone knows this or understands its deep meaning.” Then he stood up and left.