Usmani was the first to hoist the Flag of Pakistan at Karachi on 14 August 1947, and led the funeral prayers of Muhammad Ali Jinnah.

[4] In 1915, when Mahmud Hasan went into self-exile in Hijaz, Saudi Arabia, Usmani filled his position as the teacher of Sahih al-Muslim, a book of teachings of Muhammad.

[4] In 1925, Sultan Abdul Aziz Ibn Saud of Saudi Arabia scheduled a conference for prominent religious scholars from all over the world.

Shabbir Ahmad Usmani with a team of 500 Ulema eliminated the influence of these corrupt feudals from these regions and converted the sentiments of common people toward Pakistan movement.

Usmani, with a team of approximately 500 other religious leaders, actively campaigned to convert the sentiments of common Muslim people in favor of the Pakistan movement.

[4][7][8] In 1946 Usmani furnished the Quranic basis for the establishment of Pakistan by citing the distinction between momin (believer) and kafir (non-believer).

[9] Usmani died at Baghdadul Jadid in Bahawalpur State on 13 December 1949, and was buried at Islamia Science College (Karachi) the next day.

[10] His death is seen as the end of an important phase in the movement for the establishment of an Islamic constitution in newly independent Pakistan, as noted by Sayyid A. S. Pirzada, a scholar from Quaid-i-Azam University.