"Those who intend to or humiliate clerics must learn from Qandeel Baloch's fate," Mufti Abdul Qawi said.
Qawi was last month embroiled in a scandal with Qandeel after she uploaded her pictures with him during a meeting.
Qandeel, 26, was killed yesterday by her brother for what he said was "dishonouring" the family by posting risque videos and posts on Facebook.
"I had forgiven Qandeel for what she had done against me. I have never had any hatred for her," he told Express Tribune newspaper.
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Qandeel had ridiculed Qawi on various TV channels and tried to imply that he was crazy about herself.
Qawi said: "I had met Qandeel in an effort to bring her the path of righteousness. I was asked by some people why you met Qandeel. I told them we should hate sin but not a sinner."
"I had convinced Qandeel to repent on her sins and asked her to come towards the right path. I had even offered her a marriage proposal in her new life," Qawi said.
Qandeel had received threats from the supporters of Mufti Qawi for allegedly trying to disgrace him.
Following that she had requested security from the interior ministry which she was denied.
Demonstrators raised slogans like 'Stop Violence against Women'.
Some of the slogans read: 'We Failed You Qandeel', 'No Country for Bold Women', 'No Honour in Killing'.
The protesters demanded exemplary punishment for the killer, action by the media regulatory authority against TV channels who assassinated her character and posthumously disrespected her by broadcasting images of her body.
Awami Workers Party General Secretary Farooq Tariq said Qandeel joined thousands of women in Pakistan and around the world who were raped, mutilated and murdered by men.
Some 1,100 women were killed in Pakistan last year in the name of honour.