Matthew 17:1
Six days later Jesus took with Him Peter and James and John the brother of James, and led them up on a high mountain by themselves.
Matthew 26:37
And taking with Him Peter and the two sons of Zebedee [James and John], He began to be grieved and greatly distressed.
Mark 5:37
And He allowed no one to go with Him [as witnesses], except Peter and
Luke 9:28-36
Now about eight days after these teachings, He took along Peter and John and James and went up on the mountain to pray.
Mark 9:2-13
Six days later, Jesus took with Him Peter and James and John, and led them up on a high mountain by themselves. And He was transfigured (changed in form) before them [and began to shine brightly with divine and regal glory];
Luke 8:51
When He came to the house, He allowed no one to enter with Him, except Peter and John and James, and the girl’s father and mother.
2 Corinthians 13:1
This is the third time that I am visiting you. Every fact shall be sustained and confirmed by the testimony of two or three witnesses.
2 Peter 1:18
and we [actually] heard this voice made from heaven when we were together with Him on the holy mountain.