Exodus 25:10

Καὶ ποιήσεις κιβωτὸν μαρτυρίου ἐκ ξύλων ἀσήπτων, δύο πήχεων καὶ ἡμίσους τὸ μῆκος, καὶ πήχεος καὶ ἡμίσους τὸ πλάτος, καὶ πήχεος καὶ ἡμίσους τὸ ὕψος.

And you shall make the ark of witness from undecayed wood, the length of two cubits and a half, and the width of a cubit and a half, and the height of a cubit and a half.

ועשׂו ארון עצי שׁטים אמתים וחצי ארכו ואמה וחצי רחבו ואמה וחצי קמתו׃

*   Exodus 25:10 = Exodus 25:9 in other LXX editions
*   μαρτυρίου is NOT in Hebrew
*   witness OR testimony
*   undecayed OR incorruptible