Jesus rode into Jerusalem on what, according to the gospel of Matthew?

An ass and the colt of an ass

(Must have taken some practice!)

And when they drew nigh unto Jerusalem, and were come to Bethphage, unto the mount of Olives, then sent Jesus two disciples,

Saying unto them, Go into the village over against you, and straightway ye shall find an ass tied, and a colt with her: loose them, and bring them unto me.

And if any man say ought unto you, ye shall say, The Lord hath need of them; and straightway he will send them.

All this was done, that it might be fulfilled which was spoken by the prophet, saying,

Tell ye the daughter of Sion, Behold, thy King cometh unto thee, meek, and sitting upon an ass, and a colt the foal of an ass.

And the disciples went, and did as Jesus commanded them,

And brought the ass, and the colt, and put on them their clothes, and they set him thereon. Matthew 21:1-7