Mark 9:15
And straightway all the people, when they beheld him, were greatly amazed, and running to him saluted him.
Cross-reference
Mark 9:2
Historical context
Mark 9:2 describes the transfiguration's glory—the crowd's amazement here may stem from the radiance Jesus retained coming down the mountain.
Mark 9:3
Historical context
Mark 9:3 details Jesus' dazzling white clothes in the transfiguration—the crowd's reaction here likely reflects that visible glory.
Exodus 34:30
Typology
Exodus 34:30 has Moses' shining face terrify the people—Jesus' transfigured appearance here causes similar amazement, marking him as a new Moses.