LXX Deut 32:47

ὅτι οὐχὶ λόγος κενὸς οὗτος ὑμῖν, ὅτι αὕτη ἡ ζωὴ ὑμῶν, καὶ ἕνεκεν τοῦ λόγου τούτου μακροημερεύτσετε ἐπὶ τῆς γῆς εἰς ἣν ὑμεῖς διαβαίνετε τὸν Ἰορδάνην ἐκεῖ κληρονομῆσαι.

For they are not idle words to you, because they are your life, and by them you will live long in the land that you are crossing the Jordan to possess.”