Matthew Henry on Ezra 4:1-5

Every attempt to revive true religion will stir up the opposition of Satan, and of those in whom he works. The adversaries were the Samaritans, who had been planted in the land of Israel, 2Ki 17. It was plain that they did not mean to unite in the worship of the Lord, according to his word. Let those who discourage a good work, and weaken them that are employed in it, see whose pattern they follow. (Ezr 4:6-24)