A Kontakion of St Romanus

There are many more here:

Lo, our King, meek and gentle, seated upon an ass
With haste hurries to suffer and to cut suffering --
The Word upon the dumb, willing it that rational beings be redeemed.
And it was possible to behold the One on the back of the ass
Who is on the shoulders of the Cherubim,
The One Who once translated Elijah in a fiery chariot,
The One Who is poor of His own will, but rich in His nature,
The One Who is voluntarily weak, yet granting power
To all of those who cry out to Him: "Thou art the blessed One Who comes to call up Adam."