Why did God restrict the age that a priest could serve (Numbers 8:24-26)?

The age (v. 24) of twenty-five years shows maturity for service; that is, the full energy of the Spirit. Exemption from service was given as a blessing, but keeping the charge remains. The priestly service never departs, but we get greater in it. We, the saints now, are the offering up of the Gentiles to God. True honour in service is that we are wholly the Lord's. It is a saying, that if an angel came down from heaven to earth, he would be as glad to sweep the streets as to be a king, the only honour just to do what God set him to do. We should not be seeking ourselves, but the Lord's glory. God's order in His house, in the sanctuary, is the object of admiration and wonder in the heavenly places - the light of the Holy Ghost shining down over against the candlestick, showing out all its beauty and perfectness after the pattern of heavenly things.

Their period of service was fixed. It was uniform, from 25 to 50 years. It was a gracious provision that at 50 the Levite was permitted to retire from the harder work. There is no clash here with the statement of chapter 4. From 25 to 30 they could do the lighter work of the tabernacle, even as the Levites over 50 years were exempt from the harder tasks. The Lord still fixes the period in which His servants are to serve Him, as He also looks out for their comfort (John 21:12, 18-19).

The service of the Levites was strictly limited to 25 years, beginning at age 25 and ending at 50. After 50 they were allowed still to assist the other Levites in ministering, but were to do no work. This does show that while age will necessarily limit our physical labor, it does not limit assisting in ways that we can, therefore there is no reason for one to be set aside from doing spiritual service. Even a woman, Anna, is a lovely example of this (Luke 2:36-38). A true prophetess, having been a widow for 84 years, she "served God with fasting and prayers night and day." John too, when over 90 years of age, was given the wonderful privilege of serving God in writing the Book of Revelation.

But more have we to notice. If God called people to do His work, He will provide all that is needed to carry it on. Of this the Gershonites and the Merarites had marked proof. Their work, when on the march, was more onerous than that of the Kohathites. Two wagons and four oxen, part of the offering of the princes of the twelve tribes when the Tabernacle was reared up, were allotted by Moses to the Gershonites; and four wagons and eight oxen to the Merarites (7). Thought was taken for both of these great families, and the one which had the heaviest burden had the greatest help. What consideration was there in this! Nor was it a solitary instance of it. To bear burdens required strength. Now God would not overtax the strength of any one called to labour for Him. So none were called on to take part in Levitical work of bearing burdens, till they had reached thirty years of age, nor were they asked to continue such service after fifty years of age. In the matter of help provided by the wagons the Gershonites and the Merarites alone profited. In the consideration, not to overtax the strength of any Levite, the Kohathites also shared. What a thing it was, and is, to be the servants of God. He, the Almighty, thinks of them, and considers them.

The closing verses show that Levitical service began at twenty-five years of age, and after five preliminary years, full service began at thirty and continued until fifty. After fifty their heavy labours ended but they still ministered and kept the charge. Old age did not end their privilege of service but only altered its character.

On the surface there does, undoubtedly, seem to be a discrepancy between these scriptures as to the age at which the Levites commenced their service. But there cannot be, by any possibility, a mistake on such a simple matter; and the difficulty is at once removed by the suggestion often made, and generally accepted, that they were tested from twenty-five to thirty before they finally entered upon their appointed work. If so, the first five years were a probationary period before their formal installation. Then, at the age of fifty, they were to cease waiting upon the service of the tabernacle, and were to serve no more. Still, they were to continue to "minister with their brethren in the tabernacle of the congregation, to keep the charge, and shall do no service." Thus they were no longer to carry the appointed burdens (chapter 4) in their journeyings through the wilderness, though they might share with their "brethren in the tabernacle of the congregation." But they were still to keep the charge of the Lord, if they did no service. As the people in chapter 9 both journeyed and rested at the commandment of the Lord, so the Levites kept "the charge" both in their labours and when they ceased waiting upon their service. We learn that the will of the Lord is thus to govern us equally, whether in activity or retirement; at His word we are to labour, and at His word we are to rest. The only concern, therefore, of the servant is to be in communion with the Lord's mind.

The term of service is here extended on both sides of the twenty years of burden-bearing. They entered at twenty-five, and after fifty ministered with their brethren, but had no proper charge.

Of the Levites there were three main branches: the GERSHONITES, the KOHATHITES, and the MERARITES. Moses and Aaron were descendants of Kohath. When the camp of Israel rested, this tribe surrounded the tabernacle. When it moved they had to carry its various parts and the sacred things belonging thereto. According to Num. 4:3, etc., the Levites appear to have commenced their tabernacle service at the age of thirty; but in Num. 8:24-26 the age is given as twenty-five. It may be that they spent the first five years on probation, learning their duties. When Israel had settled in Canaan and the labour of carrying the tabernacle was over, they commenced their service at the age of twenty. They laboured till they were fifty years of age. 1 Chr. 23:24-27.

Depending on the precise task in hand, Levites started their active service at the age of 25 or 30 years of age, and they retired into an advisory role when they were 50 (Numbers 3 and 4). In Christian service, a certain amount of maturity is required, no doubt different levels of it for different tasks; and a point in time comes when active service is over. This may not be at age 50, but it could be any time. When the Lord comes, our ‘window of opportunity' to serve Him ‘in the desert' will have gone!

The order of marching is arranged, captains are appointed. The Levites as having to do with the Tabernacle are numbered by the principal families and the special duties of each are assigned. The observance of due order in all that pertains to His worship and service is of great importance: nor less in the church than with Israel. From twenty years old the men of other tribes were numbered for war; but the Levites must be thirty before they were I permitted to begin their service; they must at least be beyond the age when the rashness and impulsiveness of youth might influence them.