Tell the daughter of Zion, “Look!, your King comes to you, meek, and riding on a donkey, even on a colt the foal of a donkey.”a Bible
From Zech. 9:9.

Quoted from Isaiah 62:11 and Zechariah 9:9

“Look!” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20 (“Look!).

Commentary for: Matthew 21:5