David
Psalm 126:2ESV·traditional attribution

Then our mouth was filled with laughter, and our tongue with shouts of joy; then they said among the nations, “The LORD has done great things for them.”

John Calvin Reformed @genevareformer

PSALM 126 This Psalm consists of three parts. First, the Prophet exhorts the faithful, who had returned from the captivity, to gratitude, and highly extols the grace displayed in their deliverance, to show them, beyond all doubt, that they were brought back to their own country by the hand of God, and not by a fortuitous conjuncture of circumstances, or by the favor of men.

Commenting on Psalm 126:1-6

C.H. Spurgeon Reformed Baptist @princeofpreachers

Then was our mouth filled with laughter, and our tongue with singing. So full were they of joy that they could not contain themselves. They must express their joy and yet they could not find expression for it. Irrepressible mirth could do no other than laugh, for speech was far too dull a thing for it.

Matthew Henry Presbyterian @wholebiblehenry

While the people of Israel were captives in Babylon their harps were hung upon the willow-trees, for then God called to weeping and mourning, then he mourned unto them and they lamented; but now that their captivity is turned they resume their harps; Providence pipes to them, and they dance. Thus must we accommodate ourselves to all the dispensations of Providence and be suitably affected with them.

Commenting on Psalm 126:1-3