Pakistan's noted jurist and the country's greatest bibliophile. Khalid resigned from his position as Advocate General, in 1964, after his disagreement with the government brief in a high profile political case, Jama'at-e-Islami Pakistan versus the Government of West Pakistan - the Jama'at had challenged the government order banning the party. Khalid practised successfully civil law in Sindh High Court as well as the Supreme Court of Pakistan. One of his sad decisions was his accepting a brief from the Nawab Sharif government to seek a review of the Federal Shari'at Court judgement declaring void 22 monetary laws enacted between 1839 and 1979 because these laws involved interest transaction and were, therefore, repugnant to the Qur'an and Sunnah. The riba case had deep personal impact on Khalid. Khalid had a passion for book collection. He annually spent million of rupees on buying books, which he would himself catalogue after browsing through each and every title. By 1999, he had built up a collection of 175,000 volumes, which was probably the biggest private library in Asia. Khalid's house in Garden East, Karachi, used to be an important rendezvous for a weekly gathering of assorted intellectuals, writers, journalists, academics, professionals, politicians and political workers. Khalid Muhammad Ishaq who was a highly cultured person was born in a village in Shikarpur and died of his illness in Karachi.