▼3:23The word ‘incipiens’ is accusative, not ablative. So this verse does not say, ‘Jesus was, in the beginning (of his ministry) about thirty years old....’ Rather, it says, ‘Jesus was beginning (to be) about thirty years of age....’ In other words, he was not yet, but about to be, thirty years old.(Conte)

▼3:23 Who was of Heli: St. Joseph, who by nature was the son of Jacob, (St. Matt. 1. 16,) in the account of the law, was son of Heli. For Heli and Jacob were brothers, by the same mother; and Heli, who was the elder, dying without issue, Jacob, as the law directed, married his widow: in consequence of such marriage, his son Joseph was reputed in the law the son of Heli.(Challoner)