According to Islamic law, “retaliation is obligatory against anyone who kills a human being purely intentionally and without right.” However, “not subject to retaliation” is “a father or mother (or their fathers or mothers) for killing their offspring, or offspring’s offspring.” (Reliance of the Traveller o1.1-2).

“Man shoots and kills two sisters for ‘honour’ in Mianwali: police,” Geo News, September 10, 2021 (thanks to The Religion of Peace):

A man shot and killed his two sisters in a suspected honour killing case in Mianwali, Geo News reported, citing police officials, on Friday….

According to the police, the murder took place in the Tariqabad neighborhood of Paplan city, where a young man named Raheel Sheikh shot and killed his two sisters in the name of “honour”.

According to sources, the two sisters were married and had come to their parents place and were angry at their in-laws.

Muslims commit 91 percent of honor killings worldwide. The Palestinian Authority gives pardons or suspended sentences for honor murders. Iraqi women have asked for tougher sentences for Islamic honor murderers, who get off lightly now. Syria in 2009 scrapped a law limiting the length of sentences for honor killings, but “the new law says a man can still benefit from extenuating circumstances in crimes of passion or honour ‘provided he serves a prison term of no less than two years in the case of killing.’”