A.T. Robertson Commentary Luke 19:5

"And when Jesus came to the place, he looked up, and said unto him, Zacchaeus, make haste, and come down; for to-day I must abide at thy house." — Luke 19:5 (ASV)

Make haste and come down (σπευσας καταβηθ). Simultaneous aorist active participle (σπευσας) with the second aorist active imperative. "Come down in a hurry."