## And it happened ##

This phrase is used here to mark an important event in the story. If your language has a way for doing this, you could consider using it here.

## these words ##

This refers to what Jesus said to his disciples in the preceding verses.

## into the mountain ##

This could be translated as "on the side of a mountain." It is unclear how far up the mountain they went.

## the appearance of his face looked different ##

This could be translated as "the appearance of his face changed."

## white and dazzling ##

"shining white and brilliant" or "brilliant white and shining" or "dazzling white and shining like lightening" (UDB).