Malachi 4:5

Behold, I will send you (e) Elijah the prophet before the coming of the great and (f) dreadful day of the LORD:

(e) This Christ interprets of John the Baptist, who both for his zeal, and restoring or religion, is aptly compared to Elijah; (Matthew 11:13).

(f) Which as it is true for the wicked, so does it waken the godly, and call them to repentance.