And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works.

People's New Testament

2:23 I will kill her children with death. Her children are the adherents; those who perpetuate the immoral practices. The threat implies that they shall come to certain destruction.

And all the churches shall know that I am he which searcheth the reins and hearts. By reason of the judgments inflicted.

Wesley's Notes

2:23 And I will kill her children - Those which she hath borne in adultery, and them whom she hath seduced. With death - This expression denotes death by the plague, or by some manifest stroke of God's hand. Probably the remarkable vengeance taken on her children was the token of the certainty of all the rest. And all the churches - To which thou now writest. Shall know that I search the reins - The desires. And hearts - Thoughts.

Jamieson-Fausset-Brown Bible Commentary

23. her children-(Isa 57:3; Eze 23:45, 47). Her proper adherents; not those who suffer her, but those who are begotten of her. A distinct class from the last in Re 2:22 (compare Note, see on [2678]Re 2:22), whose sin was less direct, being that only of connivance.

kill . with death-Compare the disaster that overtook the literal Jezebel's votaries of Baal, and Ahab's sons, 1Ki 18:40; 2Ki 10:6, 7, 24, 25. Kill with death is a Hebraism for slay with most sure and awful death; so "dying thou shalt die" (Ge 2:17). Not "die the common death of men" (Nu 16:29).

all the churches shall know-implying that these addresses are designed for the catholic Church of all ages and places. So palpably shall God's hand be seen in the judgment on Thyatira, that the whole Church shall recognize it as God's doing.

I am he-the "I" is strongly emphatical: "that it is I am He who," &c.

searcheth . hearts-God's peculiar attribute is given to Christ. The "reins" are the seat of the desires; the "heart," that of the thoughts. The Greek for "searcheth" expresses an accurate following up of all tracks and windings.

unto every one of you-literally, "unto you, to each."

according to your works-to be judged not according to the mere act as it appears to man, but with reference to the motive, faith and love being the only motives which God recognizes as sound.

Matthew Henry's Concise Commentary

2:18-29 Even when the Lord knows the works of his people to be wrought in love, faith, zeal, and patience; yet if his eyes, which are as a flame of fire, observe them committing or allowing what is evil, he will rebuke, correct, or punish them. Here is praise of the ministry and people of Thyatira, by One who knew the principles from which they acted. They grew wiser and better. All Christians should earnestly desire that their last works may be their best works. Yet this church connived at some wicked seducers. God is known by the judgments he executes; and by this upon seducers, he shows his certain knowledge of the hearts of men, of their principles, designs, frame, and temper. Encouragement is given to those who kept themselves pure and undefiled. It is dangerous to despise the mystery of God, and as dangerous to receive the mysteries of Satan. Let us beware of the depths of Satan, of which those who know the least are the most happy. How tender Christ is of his faithful servants! He lays nothing upon his servants but what is for their good. There is promise of an ample reward to the persevering, victorious believer; also knowledge and wisdom, suitable to their power and dominion. Christ brings day with him into the soul, the light of grace and of glory, in the presence and enjoyment of him their Lord and Saviour. After every victory let us follow up our advantage against the enemy, that we may overcome and keep the works of Christ to the end.