Thou hast turned for me - In my behalf. That is, God had heard his prayer; he had brought his troubles to an end; he had caused his sorrows to be succeeded by correspondent joy.
My mourning into dancing - Joy, exultation, every expression of rejoicing, had been made to succeed his deep sorrows. Compare Psalms 30:5. It was this which he commemorated at the dedication of his house; this joy succeeding scenes of sorrow that he now called to remembrance as he entered the place which he had reared for a permanent abode. The contrast of his circumstances now - in a palace, with every comfort of plenty and peace around him - with his former circumstances which had been so sad, made it proper for him thus to celebrate the goodness of God.
Thou hast put off my sackcloth - That which I wore, or had girded around me, as an emblem of sorrow, or in the time of my mourning. See Isaiah 3:24, note; Job 16:15, note; and Matthew 11:21, note.
And girded me with gladness - Instead of a girdle of sackcloth he had been clothed in a festive dress, or with such a dress - girded with an elegant girdle - as was worn on joyous and festive occasions. See the notes at Matthew 5:38-41.