Judges 13:18 in the King James Version
And the angel of the LORD said unto him, Why askest thou thus after my name, seeing it is secret?
Context
17 Manoah said to the LORD’s angel, “What is your name, that when your words happen, we may honor you?”
18 The LORD’s angel said to him, “Why do you ask about my name, since it is incomprehensible?”
19 So Manoah took the young goat with the meal offering, and offered it on the rock to the LORD. Then the angel did an amazing thing as Manoah and his wife watched.