16 There are six things which Jehovah hateth; Yea, seven which are an abomination unto him:
17 Haughty eyes, a lying tongue, And hands that shed innocent blood;
18 A heart that deviseth wicked purposes, Feet that are swift in running to mischief,
19 A false witness that uttereth lies, And he that soweth discord among brethren. Prov 6
If you're looking for a scriptual definition of 'murder', I say this is it; the shedding of innocent blood.
And I agree with Aaron, if it's the will of God, it isn't murder:
True... it is the shedding of "innocent blood" but as far as bing ritualistically sacrificed and burned....Isaac was "innocent". no?