Numbers 35:12 explains the protection from the avenger until trial, which is why the slayer must not be surrendered here.

Numbers 35:19 orders the avenger to kill the intentional murderer, in contrast to the protection of the unintentional killer here.

Numbers 35:22 defines unintentional killing with examples, matching the condition 'without malice' stated here.

Deuteronomy 19:6 repeats the same rationale — the avenger might kill the unintentional killer, necessitating protection.

Numbers 35:25 adds that the assembly protects and returns the killer to the city, complementing the command not to surrender him.