Numbers 4:23

From thirty years old and upward until fifty years old shalt thou number them; all that enter in to perform the service, to do the work in the tabernacle of the congregation. {to perform...: Heb. to war the warfare}

Numbers 8:24-26

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: {to...: Heb. to war the warfare of, etc}

Luke 3:23

And Jesus himself began to be about thirty years of age, being (as was supposed) the son of Joseph, which was {the son} of Heli,

1 Chronicles 23:24-32

These {were} the sons of Levi after the house of their fathers; {even} the chief of the fathers, as they were counted by number of names by their polls, that did the work for the service of the house of the LORD, from the age of twenty years and upward.

2 Kings 11:4-12

And the seventh year Jehoiada sent and fetched the rulers over hundreds, with the captains and the guard, and brought them to him into the house of the LORD, and made a covenant with them, and took an oath of them in the house of the LORD, and shewed them the king's son.

1 Chronicles 23:3-5

Now the Levites were numbered from the age of thirty years and upward: and their number by their polls, man by man, was thirty and eight thousand.

Ephesians 6:10-18

Finally, my brethren, be strong in the Lord, and in the power of his might.

1 Timothy 1:18

This charge I commit unto thee, son Timothy, according to the prophecies which went before on thee, that thou by them mightest war a good warfare;