John Gill Commentary John 12:14

"And Jesus, having found a young ass, sat thereon; as it is written," — John 12:14 (ASV)

And Jesus, when he had found a young ass
Which he sent his disciples for, to a neighbouring village, and they brought to him:

sat on it, as it is written ;
in (Zechariah 9:9) though some part of the words seems to be taken out of (Isaiah 62:11) ; (See Gill on Matthew 21:5); and so Nonnus paraphrases it here, "that it might be fulfilled which Esaias said".