Christ's Entry into Jerusalem by Hippolyte Flandrin c. 1842

Rejoice greatly, O daughter of Zion; shout, O daughter of Jerusalem: behold, thy King cometh unto thee: he is just [righteous], and having salvation; lowly [humble], and riding upon an ass, and upon a colt the foal of an ass” – Zechariah 9:9, an Old Testament prophet from the time of King Darius

“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.   And a very great multitude spread their garments in the way; others cut down branches from the trees, and strawed [them] in the way.  And the multitudes that went before, and that followed, cried, saying, Hosanna to the Son of David: Blessed [is] he that cometh in the name of the
Lord; Hosanna in the highest.

— Matthew 21:1-10