There was a certain man of Zorah, of the family of the Danites, whose name was Manoah; and his wife was barren, and didn't bear.
This annunciation to the wife of Manoah was similar to the annunciations to Hannah, Elizabeth, and the Virgin Mary, except that this annunciation was made by the Angel of Jehovah, whereas the annunciation to Mary was by the angel Gabriel.  The author of this account is careful to let the reader know from the first the true identity of the Angel of Jehovah, although Manoah does not catch on to this until later in the narrative.