Matth. 21, 1-9.
Now when they were come near Jerusalem to Bethphage, unto the mount of Olives, Jesus sent two of his disciples, and said unto them: Go into the place which is before you, and soon ye shall find an ass tied, and a colt with her; loose her, and bring her unto me. And if any man say any thing unto you, say, The Lord hath need of her; and he will soon let her go unto you. Now all these things came to pass, that it might be fulfilled which was spoken by the prophet, saying, Tell the daughter of Zion, Behold, thy King cometh unto thee meekly, riding upon an ass, and upon a colt of the burthen of an ass. The disciples went and did as Jesus had commanded them, and brought the ass and the colt, and laid their garments thereon, and set him thereon. But many of the people spread the garments on the road; the others cut branches from the trees and scattered them on the road. And the people that went before and followed cried out, saying, Hosanna to the Son of David: blessed be he that cometh in the name of the Lord, Hosanna in the highest.
You have the interpretation of the Gospel on the first Sunday of Advent.