Parallel
Deuteronomy 27:5
Swete's Septuagint · Berean Standard Bible
καὶ οἰκοδομήσεις ἐκεῖ θυσιαστήριον κυρίῳ τῷ θεῷ σου, θυσιαστήριον ἐκ λίθων, οὐκ ἐπιβαλεῖς ἐπ’ αὐτὸ σίδηρον.
Moreover, you are to build there an altar to the LORD your God, an altar of stones. You must not use any iron tool on them.