Zechariah 11:8

Three shepherds also—in one month— The great Shepherd, the Messiah, goes on to speak, agreeably to the ancient custom, of hiring shepherds for a month. The priests were frequently changed among the Jews during the latter part of their polity or commonwealth; whence the priesthood became venal, or was disposed of at the will of the Romans; and to such priests the latter part of the verse is justly applicable.