Zacharias is a priest, chosen by lot to serve in the temple (8-9) and burn incense. Nothing seems remarkable--he’s “performing his priestly service before God in the order of his division, according to the custom of the priestly office.” Zacharias is going about his business as if nothing were unusual, as if this were just another day.
Granade, S. Ray, "Advent Devotional "Zacharias"" (1997). Creative Works. 25.