Mark 11:4

And they went their way, and found the colt tied by the door without in a place where two ways met; and they loose him.

Cross-reference

Matthew 21:7 adds that they brought both the donkey and the colt and put cloaks on them — additional details beyond Mark's account.

Luke 19:32-34 gives the full parallel: disciples find the colt exactly as Jesus said, and the owners ask the question — confirming the prophecy.

Matthew 21:5 Prophetic fulfillment

Matthew 21:5 quotes Zechariah 9:9, the prophecy of the king on a donkey — the finding of the colt here begins its fulfillment.

Matthew 21:6 summarizes the disciples' obedience to Jesus' command — the fulfillment of the instruction in Mark.