דְּשָׁאִים אוֺמְרִים - Grasses Say
Tehillim 104:31
יְהִי כְבוֹד יְהוָה לְעוֹלָם יִשְׂמַח יְהוָה בְּמַעֲשָׂיו
yehi chevod HASHEM le'olam yismach HASHEM bema'asav
May the glory of HASHEM endure forever; let HASHEM rejoice in His works.
King David prays that no part of the world should perish in the kind of upheaval that destoryed Sedom and Amorah, when G-d in His fury acted to destroy them. On the contrary, "let HASHEM rejoice in His works," for they bear witness to His wisdom. As it says, "The work of My hands, that I may be glorified" (Yeshayahu 60:21)
Having now completed the description of all the works of Creation, King David declares that everything depends on the will of the Holy One. If that is His will, HASHEM will "rejoice in His works," unlike what happened before, when G-d was grieved in His heart (Bereishit 6:6) about the Flood Generation, the Bavel Generation, and about Sedom and Amorah, who corrupted their deeds. Then HASHEM did not rejoice in His works.
G-d will rejoice in His works when the Mashiach comes. This is hinted at in the letters of ישמח (yismach), which are also the letters of משיח - the Mashiach. (Me'am Lo'ez)
