And unto Hamor and unto Shechem his son hearkened all that went out of the gate of his city; and every male was circumcised, all that went out of the gate of his city.

Matthew Henry's Concise Commentary

34:20-31 The Shechemites submitted to the sacred rite, only to serve a turn, to please their prince, and to enrich themselves, and it was just with God to bring punishment upon them. As nothing secures us better than true religion, so nothing exposes us more than religion only pretended to. But Simeon and Levi were most unrighteous. Those who act wickedly, under the pretext of religion, are the worst enemies of the truth, and harden the hearts of many to destruction. The crimes of others form no excuse for us. Alas! how one sin leads on to another, and, like flames of fire, spread desolation in every direction! Foolish pleasures lead to seduction; seduction produces wrath; wrath thirsts for revenge; the thirst of revenge has recourse to treachery; treachery issues in murder; and murder is followed by other lawless actions. Were we to trace the history of unlawful commerce between the sexes, we should find it, more than any other sin, ending in blood.

Matthew Henry's Whole Bible Commentary

Verses 18-24

Here, 1. Hamor and Shechem gave consent themselves to be circumcised, v. 18, 19. To this perhaps they were moved, not only by the strong desire they had to bring about this match, but by what they might have heard of the sacred and honourable intentions of this sign, in the family of Abraham, which, it is probable, they had some confused notions of, and of the promises confirmed by it, which made them the more desirous to incorporate with the family of Jacob, Zec. 8:23. Note, Many who know little of religion, yet know so much of it as makes them willing to join themselves with those that are religious. Again, If a man would take upon him a form of religion to gain a good wife, much more should we embrace the power of it to gain the favour of a good God, even circumcise our hearts to love him, and, as Shechem here, not defer to do the thing. 2. They gained the consent of the men of their city, Jacob's sons requiring that they also should be circumcised. (1.) They themselves had great influences upon them by their command and example. Note, Religion would greatly prevail if those in authority, who, like Shechem, are more honourable than their neighbours, would appear forward and zealous for it. (2.) They urged an argument which was very cogent (v. 23), Shall not their cattle and their substance be ours? They observed that Jacob's sons were industrious thriving people, and promised themselves and their neighbours advantage by an alliance with them; it would improve ground and trade, and bring money into their country. Now, [1.] It was bad enough to marry upon this principle: yet we see covetousness the greatest matchmaker in the world, and nothing designed so much, with many, as the laying of house to house, and field to field, without regard had to any other consideration. [2.] It was worse to be circumcised upon this principle. The Shechemites will embrace the religion of Jacob's family only in hopes of interesting themselves thereby in the riches of that family. Thus there are many with whom gain is godliness, and who are more governed and influenced by their secular interest than by any principle of their religion.