LXX Num 9:11

ἐν τῷ μηνὶ τῷ δευτέρῳ ἐν τῇ τεσσαρε ἡμέρᾳ τὸ πρὸς ἑσπέραν ποιήσουσιν αὐτό. ἐπ’ ἀζύμων καὶ πικρ φάγονται αὐτό,

Such people are to observe it at twilight on the fourteenth day of the second month. They are to eat the lamb, together with unleavened bread and bitter herbs;