Charles Ellicott Commentary Psalms 104:31

"Let the glory of Jehovah endure for ever; Let Jehovah rejoice in his works:" — Psalms 104:31 (ASV)

The Lord shall rejoice. —The poet still follows Genesis in representing God as looking on His finished work with pleasure, but he says nothing of a sabbath. But it is possible that the thought of the sabbath hymns of praise led him to join man with the Divine Being in celebrating the glory and perfection of creation.