Psalms 127:1 - Joseph Benson’s Commentary on the Old and New Testaments

Except the Lord build the house That is, assist and bless those that build it, whether an artificial house, such as the temple, or the royal palace, or any of those numerous structures which Solomon raised; or rather, a natural or civil house, a family or kingdom; they labour in vain that build it They will never succeed well in their attempts, bring it to perfection, or have any comfort in it. The success of all our undertakings depends so entirely upon God's blessing, that it is in vain to attempt any thing without it: in vain is it to build houses and cities, or to endeavour to uphold families, or establish states, unless he prosper the design: and the care of the watchman, of the soldier, or magistrate, is to no purpose, unless the divine providence be likewise the guard. “In every undertaking the blessing of God must accompany the labours of man to render them effectual. No work can prosper without him; nor can any design miscarry under his favour and protection. Above all men they ought to implore the divine grace and benediction, who are employed either in building or defending the spiritual house and city of God; especially as the same persons, like the Jews after the captivity, surrounded by enemies, always ready to obstruct the work, are often obliged to hold a sword in one hand while they build with the other. Our own edification in faith and holiness must likewise be carried on by us in this attitude, by reason of the many temptations which are continually assailing us.” Horne.