Luke 1:69

κέρας σωτηρίας. A natural and frequent metaphor. Ezekiel 29:21, “In that day will I cause the horn of the house of Israel to bud forth.” Lamentations 2:3, “He hath cut off … all the horn of Israel.” Psalms 132:17; 1 Samuel 2:10, “He shall exalt the horn of His anointed.” (A Rabbinic writer says that there are ten horns—those of Abraham, Isaac, Joseph, Moses, the horn of the Law, of the Priesthood, of the Temple, and of Israel; and some add of the Messiah. They were all placed on the heads of the Israelites till they sinned, and then they were cut off and given to the Gentiles. Schöttgen, Hor. Hebr. ad loc.) We find the same metaphor in classic writers. “Tunc pauper cornua sumit,” Ov. Art. Am. I. 239; “addis cornua pauperi,” Hor. Od. III. xxi.18. The expression has nothing to do with the horns of the altar, 1 Kings 1:50, &c.

παιδὸς αὐτοῦ. The word does not here mean ‘son’ in the original, but ‘servant’ being the rendering of the Hebrew ebed, Psalms 132:10.