Grazers

Sozomen, Ecclesiastical History 6.33 (on ascetics of Nisibis; tr. Daniel Caner):

When they first began such philosophy they were called boskoi [grazers] because they had no homes, ate neither bread nor meat and drank no wine, but dwelt constantly in the mountains, continually praising God with prayers and hymns according to the law of the Church. At the usual meal hours they would each take a sickle and wander in the mountains, feeding off wild plants as if they were grazing.

τούτους δὲ καὶ βοσκοὺς ἀπεκάλουν, ἔναγχος τῆς τοιαύτης φιλοσοφίας ἄρξαντας. ὀνομάζουσι δὲ ὧδε αὐτοὺς, καθότι οὔτε οἰκήματα ἔχουσιν, οὔτε ἄρτον οὔτε ὄψον ἐσθίουσιν, οὔτε οἶνον πίνουσιν· ἐν δὲ τοῖς ὄρεσι διατρίβοντες, ἀεὶ τὸν Θεὸν εὐλογοῦσιν ἐν εὐχαῖς καὶ ὕμνοις κατὰ θεσμὸν τῆς ἐκκλησίας. τροφῆς δὲ ἡνίκα γένηται καιρὸς, καθάπερ νεμόμενοι, ἅρπην ἔχων ἕκαστος, ἀνὰ τὸ ὄρος περιϊόντες, τὰς βοτάνας σιτίζονται.