And, goes on Zacharias in his noble hymn, all this tender care for Israel is owing to the deep love of God.
The beautiful imagery here is derived from the magnificence of an Eastern sunrise. In his temple service at Jerusalem the priest must have seen the ruddy dawn rise grandly over the dark chain of the distant mountains, and lighting up with a blaze of golden glory the everlasting hills as they stood round about Jerusalem. The thought which pictured the advent of Messiah as a sunrise was a favorite one with the prophets. We see it in such prophecies of Isaiah and Malachi as, "Arise, shine; for thy light is come, and the glory of the Lord is risen upon thee. For behold... Gentiles shall come to thy light, and kings to the brightness of the; rising" (Isaiah 60:1-3). "Unto you that fear my Name shall the Sun of Righteousness arise with healing in his wings" (Malachi 4:2).
[Excerpt from the Pulpit Commentary]