LXX Num 10:10

καὶ ἐν ταῖς ἡμέραις τῆς εὐφροσύνης ὑμῶν καὶ ἐν ταῖς ἑορταῖς ὑμῶν καὶ ἐν ταῖς νουμηνίαις ὑμῶν σαλπιεῖτε ταῖς σάλπιγξιν ἐπὶ τοῖς ὁλοκαυτώμασιν καὶ ἐπὶ ταῖς θυσίαις τῶν σωτηρίων ὑμῶν, καὶ ἔσται ὑμῖν ἀνάμνησις ἔναντι τοῦ θεοῦ ὑμῶν· ἐγὼ κύριος ὁ Θεὸς ἑὸς ὑμῶν.

And on your joyous occasions, your appointed feasts, and the beginning of each month, you are to blow the trumpets over your burnt offerings and fellowship offerings to serve as a reminder for you before your God. I am the LORD your God.”