I gotta have my orange juice.

Peter writes:

For this reason I will not be negligent to remind you always of these things, though you know and are established in the present truth. Yes, I think it is right, as long as I am in this tent, to stir you up by reminding you, knowing that shortly I must put off my tent, just as our Lord Jesus Christ showed me. Moreover I will be careful to ensure that you always have a reminder of these things after my exodus.

For we did not follow cunningly devised fables when we made known to you the power and coming of our Lord Jesus Christ, but were eyewitnesses of His majesty. For He received from God the Father honor and glory when such a voice came to Him from the Excellent Glory: “This is My beloved Son, in whom I am well pleased.” And we heard this voice which came from heaven when we were with Him on the holy mountain.

And so we have the prophetic word confirmed, which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your hearts; knowing this first, that no prophecy of Scripture is of any private interpretation, for prophecy never came by the will of man, but holy men of God spoke as they were moved by the Holy Spirit. (2 Peter 1)

This entire passage is a reference to the transfiguration. This is somewhat obscured by variant translation of tent and tabernacle, and of the hiddenness of the word exodus.

From Matthew:

Now after six days Jesus took Peter, James, and John his brother, led them up on a high mountain by themselves; and He was transfigured before them. His face shone like the sun, and His clothes became as white as the light. And behold, Moses and Elijah appeared to them, talking with Him. Then Peter answered and said to Jesus, “Lord, it is good for us to be here; if You wish, let us make here three tents: one for You, one for Moses, and one for Elijah.”

While he was still speaking, behold, a bright cloud overshadowed them; and suddenly a voice came out of the cloud, saying, “This is My beloved Son, in whom I am well pleased. Hear Him!” And when the disciples heard it, they fell on their faces and were greatly afraid. But Jesus came and touched them and said, “Arise, and do not be afraid.” When they had lifted up their eyes, they saw no one but Jesus only.

Now as they came down from the mountain, Jesus commanded them, saying, “Tell the vision to no one until the Son of Man is risen from the dead.”

And His disciples asked Him, saying, “Why then do the scribes say that Elijah must come first?”

Jesus answered and said to them, “Indeed, Elijah is coming first and will restore all things. But I say to you that Elijah has come already, and they did not know him but did to him whatever they wished. Likewise the Son of Man is also about to suffer at their hands.” Then the disciples understood that He spoke to them of John the Baptist. (Matthew 17)

From Luke:

Now it came to pass, about eight days after these sayings, that He took Peter, John, and James and went up on the mountain to pray. As He prayed, the appearance of His face was altered, and His robe became white and glistening. And behold, two men talked with Him, who were Moses and Elijah, who appeared in glory and spoke of His exodus which He was about to accomplish at Jerusalem. But Peter and those with him were heavy with sleep; and when they were fully awake, they saw His glory and the two men who stood with Him. Then it happened, as they were parting from Him, that Peter said to Jesus, “Master, it is good for us to be here; and let us make three tents: one for You, one for Moses, and one for Elijah”—not knowing what he said.

While he was saying this, a cloud came and overshadowed them; and they were fearful as they entered the cloud. And a voice came out of the cloud, saying, “This is My beloved Son. Hear Him!” When the voice had ceased, Jesus was found alone. But they kept quiet, and told no one in those days any of the things they had seen. (Luke 9)

Given the strong connections between these passages, I think we should look for what “the Lord Jesus Christ showed me” directly in Matthew and Luke. It seems that Peter is drawing this principle from his experience at the transfiguration: on this side of the resurrection (under the sun, as it were), there is a real experience and perception of light and glory, but this comes at the expense of labor and suffering; we do not have enduring rest. We tabernacle, but we do so in our temporal flesh.