Didache

But every true prophet that wills to abide among you is worthy of his support. So also a true teacher is himself worthy, as the workman, of his support. Matthew 10:10; cf. Luke 10:7 Every first-fruit, therefore, of the products of wine-press and threshing-floor, of oxen and of sheep, you shall take and give to the prophets, for they are your high priests. But if you have not a prophet, give it to the poor. If you make a batch of dough, take the first-fruit and give according to the commandment. So also when you open a jar of wine or of oil, take the first-fruit and give it to the prophets; and of money (silver) and clothing and every possession, take the first-fruit, as it may seem good to you, and give according to the commandment.