Killing was okay in ESV Numbers 35:
וְרָצַ֞ח (wə·rā·ṣaḥ)
Conjunctive waw | Verb - Qal - Conjunctive perfect - third person masculine singular
Strong's 7523: To dash in pieces, kill, to murder
The Hebrew word ratsach (H7523) is ambiguous.
Ratsach was not okay in Exodus 20:
At Biblehub, 28 versions use "murder"; 12 older versions use "kill".
See also Can a Christian be a professional soldier?.
kills27 and the avenger of blood finds him outside the boundaries of his city of refuge, and the avenger of blood kills [H7523] the manslayer, he shall not be guilty of blood.
וְרָצַ֞ח (wə·rā·ṣaḥ)
Conjunctive waw | Verb - Qal - Conjunctive perfect - third person masculine singular
Strong's 7523: To dash in pieces, kill, to murder
The Hebrew word ratsach (H7523) is ambiguous.
Ratsach was not okay in Exodus 20:
ESV translated ratsach as "kill" in Numbers 35:27 but as "murder" in Exodus 20:13 in order to make consistent logical sense of both verses. Otherwise, they would appear contradictory.13 “You shall not murder <H7523>.
At Biblehub, 28 versions use "murder"; 12 older versions use "kill".
See also Can a Christian be a professional soldier?.