This is it that belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation:
From twenty-five years old ... - (cf. Numbers 4:3.) They entered upon their work in their 25th year, as pupils and probationers, under the superintendence and direction of their senior brethren; and they were admitted to the full discharge of their official functions at 30 years of age.