By Muhammad Saifur Rahman Nawhami Background He is Ubayd Allah b. Mas’ud b. Mahmud[1] b. Ahmad b. Ubayd Allah b. Ibrahim[2] b. Ahmad al-Mahbubi al-Bukhari. Generally, when Sadr al-Shari’ah is said, it refers to him. He is also called Sadr al-Shariah al-Asghar. The term Asghar (trans. Jr) or Thani (trans. II) is sometimes added after his title to differentiate him from his great grandfather Ahmad b. Ubayd Allah[3] who is also known as Sadr al-Shariah but with the suffix of al-Akbar (trans. Sr) or al-Awwal (trans. I). His lineage reaches the Ansari Sahabi, Ubadah b. Samit, (may Allah be pleased…