Charles Ellicott Commentary Luke 1:29

"But she was greatly troubled at the saying, and cast in her mind what manner of salutation this might be." — Luke 1:29 (ASV)

she was troubled at his saying.—The same word is used as had been used of Zacharias. With Mary, as with him, the first feeling was one of natural terror. Who was the strange visitor, and what did the strange greeting mean?