Matthew Poole and continuators on 1 Corinthians 16:22

22 If any man love not the Lord Jesus Christ , let him be Anathema, Maran-atha .

Love is an affection of the heart, but discernable by overt acts; the meaning is, If any man, by any notorious acts, declareth that he loveth not the Lord Jesus, whether he be an Hypocrite owning the Name of Christ, but living in a contempt of, and disobedience to his Commandments; or an Apostate, who sheweth his want of love to Christ, by denying him in an hour of danger and persecution; or an open Enemy and Persecutor of Christ and his Gospel.

Let him be accursed, let him be looked upon as a detestable and abominable person. Some tell us, That the Jews having three Excommunications, this word signifieth their highest degree, by which the person was given up to the Judgment and Vengeance of God: But others say, there is no such term to be found among them, and that the term Maran-atha signifies no more than, The Lord is come. Let the Jews and other vain persons say what they will, the Lord is come; and if any love him not, let him be looked on as a detestable person.