Luke 9:33

As they were departing [ε ν τ ω δ ι α χ ω ρ ι ζ ε σ θ α ι α υ τ ο υ ς]. Lit., in their departing. The verb only here in New Testament. The whole sentence is peculiar to Luke's narrative.

Master. See on ch. Luke 5:5.

Let us make. See on Matthew 17:4.

Tabernacles. See on Matthew 17:4. "Jesus might have smiled at the naive proposal of the eager apostle that they six should dwell forever in the little succoth of wattled boughs on the slopes of Hermon" (Farrar).

Not knowing what he said. Not implying any reproach to Peter, but merely as a mark of his bewilderment in his state of ecstasy.