Mark 9:2

2 Six days later, three of them did see it. Jesus took Peter, James, and John and led them up a high mountain. His appearance changed from the inside out, right before their eyes.

Mark 9:2 Meaning and Commentary

Mark 9:2

And after six days
Six days after this discourse with his disciples, in their way to Caesarea Philippi, and after they were come into those parts:

Jesus taketh with him Peter, James, and John;
favourite disciples, and a sufficient number, to be witnesses of his transfiguration:

and leadeth them up into an high mountain apart by themselves;
where he and they were alone. This was not Mount Tabor, as is generally said, but either the mountain which Caesarea was at the foot of, or it may be Mount Lebanon; (See Gill on Matthew 17:1);

and he was transfigured before them;
the above three disciples; (See Gill on Matthew 17:2).

Mark 9:2 In-Context

1 Then he drove it home by saying, "This isn't pie in the sky by and by. Some of you who are standing here are going to see it happen, see the kingdom of God arrive in full force." In a Light-Radiant Cloud

2 Six days later, three of them did see it. Jesus took Peter, James, and John and led them up a high mountain. His appearance changed from the inside out, right before their eyes.

3 His clothes shimmered, glistening white, whiter than any bleach could make them.

4 Elijah, along with Moses, came into view, in deep conversation with Jesus.

5 Peter interrupted, "Rabbi, this is a great moment! Let's build three memorials - one for you, one for Moses, one for Elijah."