Began to be about thirty years of age. — At this age the Levites entered on their full work (Numbers 4:23; Numbers 4:30; Numbers 4:35), a kind of probationary period beginning at twenty-five (Numbers 8:24) or even, in later times, when their work was lighter, at twenty (1 Chronicles 23:27). No age was fixed for the beginning of the priesthood, nor of the prophet’s work; but it may fairly be inferred that thirty was looked on as the time when manhood reached its completeness, and we may therefore believe that our Lord waited in patient humility till that age had been attained before entering on the work of His public ministry.
Being (as was supposed) the son of Joseph. — We have here to deal with the many questions which rise out of a comparison of this genealogy with that in Matthew 1. It is a subject on which volumes have been written. Here it will be enough to sum up the results of previous inquiries.