Parallel
Malachi 4:5
Swete's Septuagint · Berean Standard Bible
ὸς ἀποκαταστήσει καρδίαν πατρὸς πρὸς υἱὸν καὶ καρδίαν ἀνθρώπου πρὸς τὸν πλησίον αὐτοῖῦ, μὴ ἔλθω καὶ πατάξω τὴν γῆν ἄρδην.
Behold, I will send you Elijah the prophet before the coming of the great and awesome (note: Or dreadful; LXX glorious) Day of the LORD.