luke 9:28 And it came to pass about an eight days after these sayings, he took Peter and John and James, and went up into a mountain to pray. - Free Bible Online

      Lu 9:28-36. JESUS TRANSFIGURED.

      28. an eight days after these sayings--including the day on which this was spoken and that of the Transfiguration. Matthew and Mark say (Mt 17:1; Mr 9:2) "after six days," excluding these two days. As the "sayings" so definitely connected with the transfiguration scene are those announcing His death--at which Peter and all the Twelve were so startled and scandalized--so this scene was designed to show to the eyes as well as the heart how glorious that death was in the view of Heaven.
      Peter, James, and John--partners before in secular business; now sole witnesses of the resurrection of Jairus' daughter (Mr 5:37), the transfiguration, and the agony in the garden (Mr 14:33).
      a mountain--not Tabor, according to long tradition, with which the facts ill comport, but some one near the lake.
      to pray--for the period He had now reached was a critical and anxious one. (See on Mt 16:13). But who can adequately translate those "strong cryings and tears?" Methinks, as I steal by His side, I hear from Him these plaintive sounds, "Lord, who hath believed Our report? I am come unto Mine own and Mine own receive Me not; I am become a stranger unto My brethren, an alien to My mother's children: Consider Mine enemies, for they are many, and they hate Me with cruel hatred. Arise, O Lord, let not man prevail. Thou that dwellest between the cherubim, shine forth: Show Me a token for good: Father, glorify Thy name."

JFB.