The katechon (from Greek: τὸ κατέχον, "that what withholds", or ὁ κατέχων, "the one who withholds") is a biblical concept which has subsequently developed into a notion of political philosophy.The term is found in 2 Thessalonians 2:6-7 in an eschatological context: Christians must not behave as if the Day of the Lord would happen tomorrow, since the Son of Perdition (the Antichrist of 1 and 2 John ) must be revealed before.