Revelation 2:23

Verse 23. And I will kill her children with death] "That is, I will certainly destroy her offspring and memory, and thereby ruin her designs. Jezebel's two sons, being both kings were both slain; and after that, all the seventy sons of Ahab; (2 Kings 10:1); in all which the hand of God was very visible. In the same manner God predicts the destruction of the heretics and heresies referred to; see Revelation 2:16. It should seem by the expression, I am he which searcheth the reins and the hearts, that these heretics lurked about, and sowed their pernicious doctrines secretly. But our Saviour tells them that it was in vain, for he had power to bring their deeds to light, having that Divine power of searching into the Evilly and affections of men; and hereby he would show both them and us that he is, according to his title, The Son of God; and hath such eyes to pry into their actions, that, like a fire, they will search into every thing, and burn up the chaff which cannot stand his trial; so that the depths of Satan, mentioned in the next verse, to which this alludes, (Christ assuming here this title purposely) shall avail nothing to those who think by their secret craft to undermine the Christian religion; he will not only bring to light, but baffle all their evil intentions. See Revelation 17:9.