The Unnamed Man in Scripture is Often Jesus Himself

Jesus is referred to simply as a man in a few places:

Jeremiah 5:1 Run ye to and fro through the streets of Jerusalem, and see now, and know, and seek in the broad places thereof, if ye can find a man, if there be any that executeth judgment, that seeketh the truth; and I will pardon it.

The only man who could cause God to pardon the city Jerusalem for its sins is Jesus Christ. Christ's presence within "Jerusalem" points to His Spirit's presence with Israel of old and the corporate church of the New Testament (see Revelation 2:1 ...He...who walketh in the midst of the seven candlesticks). Of course, God was unable to find a "man" in Judah as the Spirit of God departed from all the world's churches at the time when judgment began at the house of God (1 Peter 4:17).

Another reference to an unnamed man (Christ) is found in Psalm 87:

Psalm 87:5 And of Zion it shall be said, This and that man was born in her: and the highest himself shall establish her.

6 The LORD shall count, when he writeth up the people, that this man was born there. Selah.

God writing up the people is speaking of the figurative writing of all God's elect people in the Lamb's book of life (Revelation 13:8). Jesus' birth and entry into the world, of course, has everything to do with the atonement for all whose names were written in the Lamb's book of life.

We read once more of Christ being referred to as a man in this verse:

Isaiah 4:1 And in that day seven women shall take hold of one man, saying, We will eat our own bread, and wear our own apparel: only let us be called by thy name, to take away our reproach.

The seven women are a picture of the seven churches in Revelation chapters 2 and 3. They take hold of "one man" (Jesus) but declare that they will eat their own bread (they want their own doctrines and gospel) and their own apparel (apparel in the Bible points to one's spiritual covering – such as the righteousness of Christ that is imputed to those who are saved; but in this case it’s their "own" covering). Their own righteousness indicating it is a works gospel (as the free will gospel is); therefore, they are insisting upon their own salvation plan – yet, despite wanting their own bread/apparel (own doctrines and gospel), they nonetheless still desire to be called by the man's name, which means they desire to be called Christian after the name of Christ.

James 2:18 Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.

Only Jesus qualifies to be the "man" who is saying He has works. For God does not accept the work of any man (sinful human being) insofar as justification is concerned (Galatians 2:16). Only the work of faith performed by the God man Jesus Christ is acceptable.