And if a Levite come from any of thy gates out of all Israel, where he sojourned, and come with {c} all the desire of his mind unto the place which the LORD shall choose;

(c) Meaning, to serve God whole heartedly, and not to seek ease.

Wesley's Notes

18:6 With all the desire of his mind - With full purpose to fix his abode, and to spend his whole time and strength in the service of God. It seems, the several priests were to come from their cities to the temple by turns, before David's time; and it is certain they did so after it. But if any of them were not contented with this attendance upon God in his tabernacle, or temple, and desired more entirely and constantly to devote himself to God's service there, he was permitted so to do, because this was an eminent act of piety joined with self - denial, to part with those great conveniences which he enjoyed in the city of his possession.

Jamieson-Fausset-Brown Bible Commentary

6-8. if a Levite . come with all the desire of his mind-It appears that the Levites served in rotation from the earliest times; but, from their great numbers, it was only at infrequent intervals they could be called into actual service. Should any Levite, however, under the influence of eminent piety, resolve to devote himself wholly and continually to the sacred duties of the sanctuary, he was allowed to realize his ardent wishes; and as he was admitted to a share of the work, so also to a share of the remuneration. Though he might have private property, that was to form no ground for withholding or even diminishing his claim to maintenance like the other ministering priests. The reason or principle of the enactment is obvious (1Co 9:13). At the same time, while every facility was afforded for the admission of such a zealous and self-denying officer, this admission was to be in an orderly manner: he was to minister "as all his brethren"-that is, a Gershonite with Gershonites; a Merarite with Merarites; so that there might be no derangement of the established courses.

Matthew Henry's Concise Commentary

18:1-8 Care is taken that the priests entangle not themselves with the affairs of this life, nor enrich themselves with the wealth of this world; they have better things to mind. Care is likewise taken that they want not the comforts and conveniences of this life. The people must provide for them. He that has the benefit of solemn religious assemblies, ought to give help for the comfortable support of those that minister in such assemblies.