Numbers 4:3
“From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.”
And the Lord spake unto Moses and unto Aaron, saying,
Take the sum of the sons of Kohath from among the sons of Levi, after their families, by the house of their fathers,
From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.
This shall be the service of the sons of Kohath in the tabernacle of the congregation, about the most holy things:
And when the camp setteth forward, Aaron shall come, and his sons, and they shall take down the covering vail, and cover the ark of testimony with it:
Why This Verse Was Tagged
This verse contains specific terms directly associated with this theme.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“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:”
“Not a novice, lest being lifted up with pride he fall into the condemnation of the devil.”
“And they shall keep his charge, and the charge of the whole congregation before the tabernacle of the congregation, to do the service of the tabernacle.”
“Seemeth it but a small thing unto you, that the God of Israel hath separated you from the congregation of Israel, to bring you near to himself to do the service of the tabernacle of the Lord, and to stand before the congregation to minister unto them?”
“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:”