Now when they drew near Jerusalem, and came to Bethphage, at the Mount of Olives, then Jesus sent two disciples, saying to them, "Go into the village opposite you, and immediately you will find a donkey tied, and a colt with her. Loose them and bring them to Me.  And if anyone says anything to you, you shall say, 'The Lord has need of them,' and immediately he will send them." 

All this was done that it might be fulfilled which was spoken by the prophet, saying:   "Tell the daughter of Zion, 'Behold, your King is coming to you, lowly, and sitting on a donkey, a colt, the foal of a donkey.'"

Matthew 21:1-5   (NKJV)