Mark 9:8-10

Young's Literal Translation

⁸ and suddenly, having looked around, they saw no one any more, but Jesus only with themselves.

⁹ And as they are coming down from the mount, he charged them that they may declare to no one the things that they saw, except when the Son of Man may rise out of the dead;

¹⁰ and the thing they kept to themselves, questioning together what the rising out of the dead is.