When humans are killed in the name of religion.
Human sacrifice
His trip to the shop had become a daily ritual. The islanders practiced ritual human sacrifice until the late 1930s.
"He went through his morning ritual of brushing his teeth and brewing coffee""The devil worshippers dragged in a human sacrifice for their bloody ritual"
a ritual involving the sacrifice of blood
The Aztecs apparently practiced cannibalism as part of the ritual of human sacrifice.
Sheep, cow, goat, and Buffalo can be offered as ritual sacrifice in Islam.
Two examples of ritual sacrifice in history include two million aztec sacrifices and the Sacrifice of Iphigeneia,
Sacrifice
A yajna (also yadnya, yagna, or yagya) is a Hindu ritual of sacrifice.
Ritual sacrifice
Seppuku, that is if your referring to self sacrifice by disembowlment.
The Incas used to sacrifice people in an elaborate ritual to please the Gods. A ritual is a formal religious practice or custom. It was a ritual that we always had to open our Christmas presents after the Queens speech.