"be not afraid" is just the way people spoke when the bible was rewritten into english. angels don't have a distinct ancient way of speaking. they just speak the same way the people they're speaking to do. what's the point of being a messenger if you communicate in a completely different dialect than the person you're trying to communicate with?

anyway, my point is that a seraph would appear in their true form in front of me and say "hey bitch, stop freaking out"