1 Enoch 14:8
8 And the vision was shown to me: Behold, in the vision clouds called me and a mist summoned me, and the course of the stars and the lightnings sped and hastened me, and the winds in the vision caused me to fly and lifted me upward, and took me into heaven. 9 And I went in until I drew near to a wall built of crystals and surrounded by tongues of fire: and it began to frighten me. And I entered the tongues of fire and drew near to a large house built of crystals: and the walls of the house were like a mosaic floor of crystals, and its foundation was of crystal.
2 Corinthians 12:2
1 It is necessary to go on boasting. Though it is not profitable, I will go on to visions and revelations from the Lord. 2 I know a man in Christ who fourteen years ago (whether in the body or out of the body I do not know, God knows) was caught up to the third heaven. 3 And I know that this man (whether in the body or apart from the body I do not know, God knows)
Notes and References
"... Why does Paul only ascend to the third heaven? By the mid-first century CE a seven-tiered cosmology had replaced an older three-tiered cosmology represented by the earliest portions of 1 Enoch 14. Is Paul clinging to an old fashioned cosmology? More likely, given the context of the passage where Paul is playing the fool in his debate with the boastful super-apostles that have disturbed his Corinthian disciples, is the view of Paula Gooder that Paul sets himself up as a failed mystic. He only reached the third heaven; a thorn in the side—an angel of Satan—stopped him going further, prevented him being too highly exalted (v. 7). He did not see God enthroned in the seventh heaven. He only heard some things he cannot report. His was a failed invasion of heaven, not an ascent! ..."
Fletcher-Louis, Crispin "Jewish Mysticism, the New Testament, and Rabbinic-Period Mysticism" in Bieringer, Reimund, Florentino García Martínez, Didier Pollefeyt (ed.) The New Testament and Rabbinic Literature (pp. 429-470) Brill, 2010