Greater love has no one than this: to lay down one’s life for one’s friends. The Holy Bible NIV John 15:13
(definition paraphrased from wiki)
The root for Sacrifice comes from the Latin term sacrificium (a sacrifice) derived from Latin sacrificus (performing priestly functions or sacrifices), which combines concepts sacra (sacred things) and facere (to do or perform).
Sacrifice is often understood to mean "doing without something" or "giving something up". But sacrifice occurs in metaphorical use to describe doing good for others or taking a short-term loss in return for a greater power gain, such as in a game of chess.
You shall not kill any person, God has prohibited that except in the course of justice. The Holy Qur'an 6:151