Adam Clarke on Psalms 136:25

Giveth food to all flesh - By whose universal providence every intellectual and animal being is supported and preserved. The appointing every living thing food, and that sort of food which is suited to its nature, (and the nature and habits of animals are endlessly diversified), is an overwhelming proof of the wondrous providence, wisdom, and goodness of God.

The Vulgate, Arabic, and Anglo-Saxon, add a twenty-seventh verse, by repeating here Psa 136:3 very unnecessarily.