Your Highness, President of the Islamic government of Pakistan Muhammad Diya' Al-Haqq May Allah support Islam with him! As-salamu `alaykum warahmatullah wabarakatuh (May Allah's Peace, Mercy, and Blessings be upon you!)
We have heard the news announced in radio stations and papers about your Highness' declaration of applying the rulings of the Islamic Shari`ah in Pakistan. We and all Muslims everywhere are very happy to hear that. It gives me pleasure to express my gratitude and deep appreciation of this sublime action that is approved by Allah (Exalted be He), His Messenger (peace be upon him) and every Muslim. This action is actually an obligation that all Muslim rulers must do. May Allah reward you the best, grant you success, support you with the truth, and support the truth with you!
We and all Muslims share the great happiness of the Pakistani people for such good news for which Pakistan was established. Sincere people of Pakistan looked forward to seeing the fulfillment of this dream and utilized all possible means to have it come true until Allah (Exalted be He) facilitated it at your hands. Congratulations on this great gift and blessing. We should all be happy and pleased with it as well as thank Allah (Exalted be He) for it in compliance with what Allah (may He be Praised) says: Say: "In the Bounty of Allâh, and in His Mercy (i.e. Islâm and the Qur'ân); - therein let them rejoice." That is better than what (the wealth) they amass. Go ahead, may Allah bless you! Allah is your supporter so long as you support His religion and rule according to His Shari`ah (Islamic law). Allah (may He be Praised) says: O you who believe! If you help (in the cause of) Allâh, He will help you, and make your foothold firm.
Allah (Glorified and Exalted be He) says: Verily, Allâh will help those who help His (Cause). Truly, Allâh is All-Strong, All-Mighty. Those (Muslim rulers) who, if We give them power in the land, (they) enjoin Iqamat-as-Salât [i.e. to perform the five compulsory congregational Salât (prayers) (the males in mosques)], to pay the Zakât and they enjoin Al-Ma'rûf (i.e. Islâmic Monotheism and all that Islâm orders one to do), and forbid Al-Munkar (i.e. disbelief, polytheism and all that Islâm has forbidden) [i.e. they make the Qur'ân as the law of their country in all the spheres of life]. And with Allâh rests the end of (all) matters (of creatures).
There is no law better that that of Allah Who is Well-Aware of the conditions and interests of His slaves both in the worldly life and in the Hereafter. Allah (Glorified and Exalted be He) says: Do they then seek the judgement of (the days of) Ignorance? And who is better in judgement than Allâh for a people who have firm Faith. May Allah guide you to the truth, make you steadfast on it, and increase your assistants - He is All-Hearer, Ever Near! As-salamu `alaykum warahmatullah wabarakatuh