The last prophetical voice of the OT left us with a promise of a forerunner who would prepare the way for the Messiah (
Mal 3:1,
4:5-6). 400 silent years followed, leaving us hanging, waiting, and longing. Finally, that silence was broken and the promise was fulfilled with angelic visitation from Gabriel to Zacharias. As the father of The Baptist holds his son in his arms he gives his prophecy of praise, making note of the Davidic, Abrahamic & New covenant fulfilled at Christ's coming.