Why do you think after death the angel says do not be afraid?
Search up biblically accurate angels.
Biblically Accurate Angels
Explanation
Explain Bear
Okay, so the joke is that angels in the Bible aren't all cute and cuddly like you probably think. They're actually pretty scary-looking. So, the angel is like, "Don't be afraid!" because they look terrifying. Get it? You probably didn't because you are dumb.