Do not be deceived, God is not mocked; for whatever a man sows, that he will also reap. – Galatians 6:7

It is a law in Nature that a man cannot hurt his fellows without hurting himself. Now, you who cause grief to others’ minds, do not think the grief will end there; you will have to reap a harvest even here. Again, a man cannot sin against his estate without reaping the effects of it. The miserly wretch, who hoards up his gold, sins against his gold. It becomes cankered, and from those golden sovereigns he will have to reap a harvest; yes, that miserly wretch, sitting up at night, and straining his weary eyes to count his gold, that man reaps his harvest. And so does the young spendthrift. He will reap his harvest when all his treasure is exhausted. It is said of the prodigal, that “no man gave unto him,”-none of those that he used to entertain,-and so the prodigal shall find it. No man shall give anything unto him. Ah! but the worst harvest will be that of those who sin against the Church of Christ. I would not that a man should sin against his body; I would not that a man should sin against his estate; I would not that a man should sin against his fellows; but, most of all, I would not have him touch Christ’s Church. He that touches one of God’s people, touches the apple of His eye. When I have road of some people finding fault with the servants of the Lord, I have thought within myself, “I would not do so.” It is the greatest insult to a man to speak ill of his children. You speak ill of God’s children, and you will be rewarded for it in everlasting punishment. There is not a single one of God’s family whom God does not love, and if you touch one of them, He will have vengeance on you. Nothing puts a man on his mettle like touching his children; and if you touch God’s Church, you will have the direst vengeance of all. The hottest flames of hell are for those who touch God’s children. Go on, sinner, laugh at religion if thou pleasest; but know that it is the blackest sin in the whole catalogue of crime. God will forgive anything sooner than that; and though that is not unpardonable; yet, if not repented of, it will meet the greatest punishment. God cannot bear that His elect should be touched, and if you do so, it is the greatest crime you can commit.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2896.cfm