Albert Barnes Commentary Psalms 147:15

"He sendeth out his commandment upon earth; His word runneth very swiftly." — Psalms 147:15 (ASV)

He sends forth His commandment upon earth - That is, with reference to the productions of the earth; to the changes which occur; to the seasons; to snow, frost, ice, cold, heat, wind; and He is universally and immediately obeyed. Nature everywhere yields a ready acquiescence to His will.

His word runs very swiftly - As if it hastened to obey Him. There is no delay. Compare the notes at (Psalms 33:9): He spake, and it was done; he commanded, and it stood fast. Snow, and frost, and ice, and cold, and heat, and wind, are entirely obedient to Him. There is no reluctance in obeying Him; there is no delay.