Judges 13:18 KJV
And the angel of the Lord said unto him, Why askest thou thus after my name, seeing it is secret?
Judges 13:18, King James Version
In context
17 And Manoah said unto the angel of the Lord, What is thy name, that when thy sayings come to pass we may do thee honour?
18 And the angel of the Lord said unto him, Why askest thou thus after my name, seeing it is secret?
19 So Manoah took a kid with a meat offering, and offered it upon a rock unto the Lord: and the angel did wondrously; and Manoah and his wife looked on.