Galatians 6:6 Let him that is taught in the word communicate unto him that teacheth in all good things.
Old John Gill has this insight on this verse. (Underlines added)
Let him that is taught in the word,…. Instructed in the knowledge of the word, either of the essential Word, the Lord Jesus Christ, of his person, office, and grace; or rather of the written word, particularly the Gospel, which is sometimes called the word, without any additional epithet, which distinguishes it, and directs to the sense of it; and sometimes with such, as the words of truth, the word of faith, the word of righteousness, the word of reconciliation, and the word of this salvation, so called from the nature, use, and subject matter of it. He that is taught in this, is, according to the original word used here, a “catechumen”; and which designs not one that is just beginning to learn the first principles of the oracles of God, but anyone that is instructed in it, as this word is rendered in Rom 2:18 whether more or less, or whether internally or externally: one that is internally taught in and by the word, is one that has been taught to know himself, and his lost state by nature; to know Christ, and salvation by him; to know the truths of the Gospel, and to deny ungodliness, and worldly lusts, and to live soberly, righteously, and godly. It may include everyone that is only outwardly taught, that is but an external hearer; and so the Syriac version renders the clause, דשמע מלתא, “he that hears the word”: of which there are many sorts, and on whom it is an incumbent duty to
communicate to him that teacheth; who is commissioned, and qualified and sent forth by Christ, and whose office in the church is to teach the word, to preach the Gospel, to instruct men in the truths of it, and teach them their duty also to God and men, such are to be communicated to; that is, such as are under their instructions ought to impart of their worldly substance to them, for their honourable and comfortable support and maintenance; for since they spend their time, and make use of their talents, gifts, and abilities, for their instruction in spiritual things, it is but reasonable, and no such great matter, that they partake of their carnal things; and especially since it is the will and ordinance of Christ, that they that preach the Gospel should live of it. The apostle adds,
in all good things; which may be either connected with the word “teacheth”, and so be descriptive of the teacher, as the Arabic version reads, “him that teacheth all his good things”; good doctrines, excellent truths, the wholesome words of Christ, which he is intrusted with, has a knowledge and experience of; and who freely and faithfully imparts them, and conceals and keeps back nothing, but declares the whole counsel of God, all that he knows, and that is good and profitable; and carries in it a very strong argument why he should be communicated to: or else with the word “communicate”; and the sense either be, let him be a partaker of, and join with him in everything he says or does that is good, but not in anything that is evil, which is a sense some give into; or rather let him impart of his temporal good things unto him: temporal things are good as they are of God, and in themselves, and when rightly used answer good purposes; all a man’s good things are not to be communicated, only a part, according to his ability, and in proportion to others; and yet the communication should be large and liberal, sufficient to support the teacher in an honourable manner, and to supply him with all the necessaries of life, that his mind may be free from secular cares, and he be at leisure to attend to the instructing of others.
The verse in Romans referred to it:
Rom 2:18 And knowest his will, and approvest the things that are more excellent, being instructed out of the law;
Rom 2:19 And art confident that thou thyself art a guide of the blind, a light of them which are in darkness,
Rom 2:20 An instructor of the foolish, a teacher of babes, which hast the form of knowledge and of the truth in the law.
And those who are positioned to be Elders in the church are called to exhibit this character too:
Titus 1:9 Holding fast the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.