The Holy Scripture
Didache
Chapter XIII
But every time prophet desiring to settle among you is worthy of his food.
Πᾶς δὲ προφήτης ἀληθινὸς θέλων καθῆσθαι πρὸς ὑμᾶς ἄξιός ἐστι τῆς τροφῆς αὐτοῦ.
In like manner a true teacher is also worthy, like the workman, of his food.
ὡσαύτως διδάσκαλος ἀληθινός ἐστιν ἄξιος καὶ αὐτὸς ὥσπερ ὁ ἐργάτης τῆς τροφῆς αὐτοῦ.