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