E02812: Basil of Caesarea in his Letter 93, of c. 372, reports that he receives (or celebrates) the Eucharist on the memorial days of saints. Written in Greek in Kaisareia/Caesarea of Cappadocia (central Asia Minor).

Basil of Caesarea, Letters (CPG 2900), Letter 93.

ΠΡΟΣ ΚΑΙΣΑΡΙΑΝ ΠΑΤΡΙΚΙΑΝ
ΠΕΡΙ ΚΟΙΝΩΝΙΑΣ

(1.) Καὶ τὸ κοινωνεῖν δὴ καθ’ ἑκάστην ἡμέραν καὶ μεταλαμβάνειν τοῦ ἁγίου σώματος καὶ αἵματος τοῦ Χριστοῦ καλὸν καὶ ἐπωφελές, αὐτοῦ σαφῶς λέγοντος· «Ὁ τρώγων μου τὴν σάρκα καὶ πίνων μου τὸ αἷμα ἔχει ζωὴν αἰώνιον.» Τίς γὰρ ἀμφιβάλλει ὅτι τὸ μετέχειν συνεχῶς τῆς ζωῆς οὐδὲν ἄλλο ἐστὶν ἢ ζῆν πολλαχῶς; Ἡμεῖς μέντοιγε τέταρτον καθ’ ἑκάστην ἑβδομάδα κοινωνοῦμεν, ἐν τῇ Κυριακῇ, ἐν τῇ τετράδι καὶ ἐν τῇ Παρασκευῇ καὶ τῷ Σαββάτῳ, καὶ ἐν ταῖς ἄλλαις ἡμέραις, ἐὰν ᾖ μνήμη Ἁγίου τινός.

‘To the Patrician Kaisaria, on Communion

1. Indeed, to commune even every day and partake of the holy body and blood of Christ is good and beneficial, since He himself clearly says: “He that eats my flesh and drinks my blood has eternal life.” For who can doubt that constant sharing in the Life is nothing else than multiple living? As for ourselves, we commune four times every week – on Sunday, Wednesday, Friday, and Saturday, and on the other days, if it is the memory of a saint. [……]’