Zechariah was serving God faithfully by discharging some temple function as a member of his priestly division. There were so many priests then that the great privilege of offering incense on the golden incense altar in the temple fell to a priest only once in his lifetime. [1] The priests decided who would offer incense at the daily sacrifice, morning and evening, by casting lots. Zechariah"s selection was undoubtedly a high point in his life and the greatest honor of his priestly career. Obviously God providentially arranged for his selection (cf. Esther 3:7; Proverbs 16:33). [source][source][source]