'Accidentally' in the Bible

Someone could flee there who committed manslaughter, killing his neighbor accidentally without previously hating him. He could flee to one of these cities and stay alive:

“Here is the law concerning a case of someone who kills a person and flees there to save his life, having killed his neighbor accidentally without previously hating him:

so that a person who kills someone unintentionally or accidentally may flee there. These will be your refuge from the avenger of blood.

And if the avenger of blood pursues him, they must not hand the one who committed manslaughter over to him, for he killed his neighbor accidentally and did not hate him beforehand.