John Gill Commentary Matthew 9:8

"But when the multitudes saw it, they were afraid, and glorified God, who had given such authority unto men." — Matthew 9:8 (ASV)

But when the multitude saw it
The miracle that was wrought; when they saw the man take up his bed, and carry it home, which was done by Christ, as a proof of his having power to forgive sin,

they marvelled, and glorified God :
they were struck with amazement and astonishment at the sight, it being what was strange and unusual; the like to which they had never seen before, nor heard of: and concluding it to be more than human; they ascribed it to God; they praised, and adored the divine goodness,

which had given such power unto men ;
of working miracles, healing diseases, and delivering miserable mortals from such maladies, as were otherwise incurable; still looking upon Christ as a mere man, by whom God did these things; not knowing yet the mystery of the incarnation, God manifest in the flesh.