It depends upon which Bible one uses. In the KJV, the Geneva 1599 and the American Standard Version, it is 'Thou shall not kill'. In many other Bibles the word 'murder' is used. But whether it is kill or murder, the understanding by divines is always stated within the context of what is lawful. And whether one reads Luther, Calvin or R. J. Rushdoony, it is always so.
The purpose of the covenantal injunction of the Sixth Commandment is to do no harm to one's neighbor. Hence, the deeper purpose of the Commandment is equally an instruction in how to 'love they neighbor' by doing him no harm or injury, and loving him by living responsibly with one's neighbors in a state of God's Peace. Below is from the Westminster Confession of Faith, larger confession. It illustrates the point.
WLC 135: What are the duties required in the Sixth Commandment?
Answer: The duties required in the Sixth Commandment are, all careful studies, and lawful endeavors, to preserve the life of ourselves1 and others2 by resisting all thoughts and purposes3, subduing all passions4, and avoiding all occasions5, temptations6, and practices, which tend to the unjust taking away the life of any7; by just defense thereof against violence8, patient bearing of the hand of God9, quietness of mind10, cheerfulness of spirit11; a sober use of meat12, drink13, physical14, sleep15, labour16, and recreations17; by charitable thoughts18, love19, compassion20, meekness, gentleness, kindness21; peaceable22, mild and courteous speeches and behavior23; forbearance, readiness to be reconciled, patient bearing and forgiving of injuries, and requiting good for evil24; comforting and succoring the distressed, and protecting and defending the innocent.25
So, some say 'murder' is the better usage. But I say neither 'murder' or 'kill' is adequate without expository enlargement. R. J. Rushdoony is probably the most expansive look into the meaning of the Six Commandment. This would be The Institutes of Biblical Law, Vol. 1, pages 219 - 332.
I think Thou shall not murder is the correct translation. Big difference.
It depends upon which Bible one uses. In the KJV, the Geneva 1599 and the American Standard Version, it is 'Thou shall not kill'. In many other Bibles the word 'murder' is used. But whether it is kill or murder, the understanding by divines is always stated within the context of what is lawful. And whether one reads Luther, Calvin or R. J. Rushdoony, it is always so.
The purpose of the covenantal injunction of the Sixth Commandment is to do no harm to one's neighbor. Hence, the deeper purpose of the Commandment is equally an instruction in how to 'love they neighbor' by doing him no harm or injury, and loving him by living responsibly with one's neighbors in a state of God's Peace. Below is from the Westminster Confession of Faith, larger confession. It illustrates the point.
WLC 135: What are the duties required in the Sixth Commandment?
https://thewestminsterstandards.com/wlc-135-what-are-the-duties-required-in-the-sixth-commandment/
Answer: The duties required in the Sixth Commandment are, all careful studies, and lawful endeavors, to preserve the life of ourselves1 and others2 by resisting all thoughts and purposes3, subduing all passions4, and avoiding all occasions5, temptations6, and practices, which tend to the unjust taking away the life of any7; by just defense thereof against violence8, patient bearing of the hand of God9, quietness of mind10, cheerfulness of spirit11; a sober use of meat12, drink13, physical14, sleep15, labour16, and recreations17; by charitable thoughts18, love19, compassion20, meekness, gentleness, kindness21; peaceable22, mild and courteous speeches and behavior23; forbearance, readiness to be reconciled, patient bearing and forgiving of injuries, and requiting good for evil24; comforting and succoring the distressed, and protecting and defending the innocent.25
So, some say 'murder' is the better usage. But I say neither 'murder' or 'kill' is adequate without expository enlargement. R. J. Rushdoony is probably the most expansive look into the meaning of the Six Commandment. This would be The Institutes of Biblical Law, Vol. 1, pages 219 - 332.