3 John 1:7

This means that the servants of God have accepted no assistance from those who are not believers.

Because that for his name's sake they went forth,....

Because that for his name’s sake - The word “his” here refers to God; and the idea is, that they had undertaken this journey not on their own account, but in the cause of religion. They went forth - Or, “they have gone forth” - ἐξῆλθον exēlthon - referring to the journey which they had then undertaken; not to the former one. Taking nothing of the Gentiles - The term “Gentile” embraced all who were not “Jews,” and it is evident that these persons went forth particularly to labor among the pagan.

It would have been inexpedient to have taken aught (the Greek "meden" implies, not that they got nothing, though they had desired it, but that it was of their own choice they took nothing) from the infant churches among the heathen: the case was different in receiving hospitality from Gaius.

For his name’s sake they went forth - For the sake of preaching the Gospel of the grace of God, and making known Jesus to the heathen. Taking nothing of the Gentiles - Receiving no emolument for their labor, but in every respect showing themselves to be truly disinterested. Sometimes, and on some special occasions, this may be necessary; but the laborer is worthy of his hire is the maxim of the author of Christianity. And those congregations of Christians are ever found to prize the Gospel most, and profit most by it, who bear all expenses incident to it, and vice versa. But some construe εξηλθον, they went out, with απο των εθνων, from the Gentiles, or rather by the Gentiles, and give the passage this sense: They went out, i.e., were driven out by the Gentiles, taking nothing with them, i.e., leaving all their property behind, so that they were in a state of great destitution. A curious reading here, εθνικων, heathenish men, for εθνων, Gentiles, which latter might imply those who were converted from among the Gentiles, while the sense of the other term seems to be restrained to those who were still unconverted, may seem to strengthen the above interpretation; and although the construction seems rather harsh, yet it is not, on the whole, unlikely. The reading above referred to is that of the most ancient and reputable MSS. That to be driven out or expelled is one scriptural meaning of the verb εξερχομαι, see Mat 8:32: And when they were come out, οἱ δε εξελθοντεσς, and when they were Driven Out. Mat 12:43: When the unclean spirit is gone out, εξελθη, is Driven Out. See Mar 5:13, Mar 7:29: The devil is gone out of thy daughter, εξεληλυθε, is Expelled. Mar 9:29: This kind can come forth by nothing εν ουδενι δυναται εξελθειν, can be Driven Out by nothing, but by prayer and fasting. […]