On Traditions About Musa Ibn Ja’far صلى الله عليه وعلى آله وسلم, Harun Ar-rashid and Musa Ibn Al-mahdi

7-6 My father رضي الله عنه narrated that Ali ibn Ibrahim ibn Hashem quoted on the authority of his father, on the authority of Uthman ibn Isa, on the authority of his companions, “In the presence of Musa ibn Ja’far عليه السلام, Abu Yusuf asked Al-Mahdi , “Will you grant me permission to ask him questions which he will fail to answer?” He replied, “Yes.” Then he asked Musa ibn Ja’far عليه السلام, “Should I ask?” He replied, "Yes." So he (Abu Yusuf) asked, “What is the decree for a pilgrim who is in consecration (muhrim) going in the shade?” The Imam عليه السلام said, “It is not allowed.” He asked, “What if they set up a tent and he enters it?” The Imam عليه السلام replied, “That is allowed.” He asked, “What is the difference between these two?” Abul Hassan عليه السلام asked, “Should a menstruating woman make up her prayers?” He replied, “No.” The Imam عليه السلام asked, “Should a menstruating woman make up her fasts?” He replied, “Yes.” The Imam عليه السلام asked, “Why?” He replied, “This is how it was decreed.” Then Abul Hassan عليه السلام said, “Likewise, this is how it was decreed.” Then Al-Mahdi told Abu Yusuf, “I see that you could not do anything?” He said, “He gave me a solid, invalidating reply.”