Keep it until the fourteenth
For the sheep was sacrificed on the fourteenth of the month in the midst of the evenings, when, as the fifteenth begins, the circle of the moon becomes most full, as those who study these things hold.
Greek
Ἐθύετο γὰρ] τὸ πρόβατον τῇ [τεσσαρεσκαι]δεκάτῃ τοῦ μηνὸς [ἀνὰ μέ]σον τῶν ἑσπερινῶν, [ὅτε, ἀρ]χομένης πεντεκαιδ[εκά]της, πληρέστατος ὁ τ[ῆς σε]λήνης κύκλος γίνετ[αι|| [ὡς τοῖς περὶ ταῦτα δοκεῖ.