John Lightfoot on Matthew 21:2

[An ass and her foal.] In the Talmudists we have the like phrase, an ass and a little colt. In that treatise Mezia, they speak concerning a hired ass, and the terms that the hired is obliged to. Among other things there, the Babylon Gemara hath these words, Whosoever transgresses against the will of the owner is called a robber. For instance, if any one hires an ass for a journey on the plains, and turns up to the mountains, &c. Hence this of our Saviour appears to be a miracle, not a robbery; that without any agreement or terms this ass should be led away; and that the owner and those that stood by should be satisfied with these bare words, "The Lord hath need of him."