The landmark ruling that Section 125 CrPC is a secular provision applicable to all irrespective of religion was delivered in Mohd. Ahmad Khan v. Shah Bano Begum, 1985. In response, Parliament enacted the Muslim Women (Protection of Rights on Divorce) Act, 1986, to protect rights of divorced Muslim women. Sayeed Khan Faujdar Khan v. Zaheba Begum (2006) subsequently applied this principle. Note: If the question intends the original landmark holding, the answer should be the Shah Bano case (1985) rather than the 2006 case.