Albert Barnes Commentary Psalms 118:15-16

"The voice of rejoicing and salvation is in the tents of the righteous: The right hand of Jehovah doeth valiantly. The right hand of Jehovah is exalted: The right hand of Jehovah doeth valiantly." — Psalms 118:15-16 (ASV)

The voice of rejoicing and salvation - Rejoicing for salvation; song, praise, thanksgiving. Luther renders this beautifully; “They sing with joy for victory in the houses of the righteous.”

Is in the tabernacles of the righteous - The tents of the righteous; their dwellings. That is:

• It is a fact that the voice of joy and rejoicing is there;
• It is appropriate that it should be so, or that a righteous family should be happy—the dwelling-place of praise;
• God will add to the happiness of the righteous, or will make their habitation happy, peaceful, blessed.

There is nothing that diffuses so much happiness through a family as religion; there is no joy like that when a member of a family is converted; there is no place on earth more happy than that where a family bows before God with the feeling that all are children of God and heirs of salvation.

The right hand of the Lord does valiantly - Hebrew “Does strength.” That is, God does great things, laying the foundation for joy and praise.