'Messenger' in the Bible

The oracle (burdensome message) of the word of the Lord to Israel through [My messenger] Malachi.

For the lips of the priest should guard and preserve knowledge [of My law], and the people should seek instruction from his mouth; for he is the messenger of the Lord of hosts.

“Behold, I am going to send My messenger, and he will prepare and clear the way before Me. And the Lord [the Messiah], whom you seek, will suddenly come to His temple; the Messenger of the covenant, in whom you delight, behold, He is coming,” says the Lord of hosts.