"These six towns will be a place of refuge for Israelites and for foreigners residing among them, so that anyone who has killed another accidentally can flee there."
Numb 35:15
It was not an unintentional act, please inform yourself about the facts before saying such things.
And Please consider the whole context.
These six cities shall be for refuge for the people of Israel, and for the stranger and for the sojourner among them, that anyone who kills any person without intent may flee there.
16 “
But if he struck him down with an iron object, so that he died, he is a murderer.
The murderer shall be put to death.
17 And if he struck him down with a stone tool that could cause death, and he died, he is a murderer.
The murderer shall be put to death.
18 Or if he struck him down with a wooden tool that could cause death, and he died,
he is a murderer. The murderer shall be put to death.
19 The avenger of blood shall himself put the murderer to death; when he meets him,
he shall put him to death.
20 And if he pushed him out of hatred or hurled something at him, lying in wait, so that he died,
21 or in enmity struck him down with his hand, so that he died, then he who struck the blow
shall be put to death. He is a murderer.
The avenger of blood shall put the murderer to death when he meets him.