Allama Ashraf Jalali, a leader of Pakistan Ahle Sunnah wa Jama'ah group and secretary of Sunni Ittehad Council, alleged Sharif committed blasphemy and attacked Pakistan's ideological basis in the speech he delivered in Karachi, according to a video of the cleric's speech circulating online.
"The prime minister said such anti-Islam and blasphemous words that the Earth should have exploded," he claimed, adding that Sharif "violated his oath, ideology of Pakistan, The Quran and Sunnah of Prophet. His speech is a dangerous attack on Islam."
It's not clear when and where the cleric was speaking and who his audiences were. However, it could be categorised as a hate speech and attract action under the anti-terrorism laws.
The Pakistan government has not reacted to the cleric's speech so far.
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On March 14, Sharif had given a bold and inclusive message saying forced conversion and discrimination against minorities were not allowed in Islam and under the laws in Pakistan.
In his greetings to the minority Hindus, Sharif had also warned against destruction of the places of worship of other religions, describing them as "a crime in Islam".
Analysts say the draconian law, under which an accused can be sentenced to death, is a powerful tool to muzzle criticism in Muslim-majority Pakistan.