some or any person or object · indefinite pronoun — nominative singular masculine
have
ἔχειechei
G2192
to hold (used in very various applications · verb — present active indicative, 3rd person singular
ear
οὖς,ous
G3775
the ear (physically or mentally) · noun — accusative singular neuter
hear
ἀκουσάτω.akousatō
G191
to hear (in various senses) · verb — aorist active imperative, 3rd person singular
Strong's Exhaustive Concordance (James Strong, 1890/1894), public domain; digitized by Open Scriptures (CC BY-SA). KJV word tagging: eBible.org (public domain). Original-language text, parsing and brief lexicon: STEPBible.org data from Tyndale House, Cambridge (CC BY 4.0).
Cross-references
Revelation 2:7 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the tree of life, wh…
Revelation 2:17 He that hath an ear, let him hear what the Spirit saith unto the churches; To him that overcometh will I give to eat of the hidden manna, an…
Revelation 2:11 He that hath an ear, let him hear what the Spirit saith unto the churches; He that overcometh shall not be hurt of the second death.
Revelation 2:29 He that hath an ear, let him hear what the Spirit saith unto the churches.
Cross-references from OpenBible.info (CC BY), in the lineage of the Treasury of Scripture Knowledge (public domain).
Commentary
Matthew Henry on Revelation 13:1-10
We have here an account of the rise, figure, and progress of the first beast; and observe, 1. From what situation the apostle saw this monster. He seemed to himself to stand upon the sea-shore, though it is probable he was still in a rapture; but he took himself to be in the island Patmos, but whether in the body or out of the body he could not tell. 2. Whence this beast came - out of the sea; and yet, by the description of it, it would seem more likely to be a land-monster; but the more monstrous every thing about it was the more proper an emblem it would be to set forth the mystery of iniquity and tyranny. 3. What was the form and shape of this beast. It was for the most part like a leopar…
A general exhortation. Christ's own words of monition calling solemn attention.
Adam Clarke on Revelation 13:9
If any man have an ear, let him hear - These words are evidently introduced to impress the reader with the awfulness of what has just been spoken - all shall worship him whose names are not written in the book of life, as well as to fix his attention upon the following words: -
John Gill on Revelation 13:9
If any man have an ear, let him hear. And diligently attend to this mystical description of antichrist, as being matter of some difficulty to understand, as well as of great moment and importance, and seriously consider it, that he may know him, and his followers, and avoid them; See Gill on Revelation 1:7.
Tyndale Open Study Notes on Revelation 13:9-10
The scene (13:1-10) ends with a dramatic conclusion patterned on Jer 15:2; 43:11. Anyone with ears to hear must pay attention, because judgment is coming (cp. Rev 2:7, 11, 17).
If anyone, he says, has a mind able to comprehend the things said, let him hear the things said and know that the one ready to take others captive will be taken captive by the beast and will voluntarily defect to it; for receiving no assistance from God, he will be carried off to utter evil.
If anyone has an ear, let him hear. Whenever Scripture interposes this saying, it seeks an attentive listener due to the obscurity of the matter. So that the momentary kingdom of the devil is not regarded highly, it meets human thoughts by saying: He who leads into captivity shall go into captivity, that is, the devil and the beast, who now seem to capture the nations with their snares, will themselves soon be captives.
Every one will receive a recompense worthy of his deeds. Those who are willing to harm their neighbor will be captured by the devil and will undergo the death of his soul by the satanic sword. For, as the great James says, they are made slaves of that one by whom they have been conquered through their works. But those who have a pure faith and unshakeable endurance in trials will be indelibly written in the book of life. With such may the all-merciful God also find us partakers who consider "that the sufferings of this present time are not worth comparing with the glory that is to be revealed" to the saints and who walk valiantly the narrow way, so that, finding at the end of it glory in the coming age and rest and paradise, we might reign with Christ, with whom to the Father be all thanksgiving and worship with the Holy Spirit forever. Amen.
The Church Fathers: public-domain translations (Ante-Nicene and Nicene and Post-Nicene Fathers), verse-indexed by SermonIndex (CC BY 4.0).