Charles H. Spurgeon on Psalms 132:11

Here we come to a grand covenant pleading of the kind which is always prevalent with the Lord. The LORD hath sworn in truth unto, David. We cannot urge anything with God which is equal to his own word and oath. Jehovah swears that our faith may have strong confidence in it: he cannot forswear himself. He swears in truth, for he means every word that he utters; men may be perjured, but none will be so profane as to imagine this of the God of truth. By Nathan this covenant of Jehovah was conveyed to David, and there was no delusion in it. He will not turn from it. Jehovah is not a changeable being. He never turns from his purpose, much less from his promise solemnly ratified by oath. He turneth never. He is not a man that he should lie, nor the son of man that he should repent. What a rock they stand upon who have an immutable oath of God for their foundation! We know that this covenant was really made with Christ, the spiritual seed of David, for Peter quotes it at Pentecost, saying, "Men and brethren, let me freely speak unto you of the patriarch David, that he is both dead and buried, and his sepulchre is with us unto this day. Therefore being a prophet, and knowing that God had sworn with an oath to him, that of the fruit of his loins, according to the flesh, he would raise up Christ to sit on his throne; he seeing this before spake of the resurrection of Christ." Christ therefore sits on a sure throne for ever and ever, seeing that he has kept the covenant, and through him the blessing comes upon Zion, whose poor are blessed in him. Of the fruit of thy body will I set upon thy throne. Jesus sprang from the race of David, as the evangelists are careful to record; he was "of the house and lineage of David": at this day he is the King of the Jews, and the Lord has also given him the heathen for his inheritance. He must reign, and of his kingdom there shall be no end. God himself has set him on the throne, and no rebellion of men or devils can shake his dominion. The honour of Jehovah is concerned in his reign, and therefore it is never in danger; for the Lord will not suffer his oath to be dishonoured.