1 Enoch 71:5
4 And he showed me all the secrets of the ends of the heaven, And all the chambers of all the stars, and all the luminaries, Whence they proceed before the face of the holy ones. 5 And he translated my spirit into the heaven of heavens, And I saw there as it were a structure built of crystals, And between those crystals tongues of living fire. 6 And my spirit saw the girdle which girt that house of fire, And on its four sides were streams full of living fire, And they girt that house.
Acts 2:3
1 Now when the day of Pentecost had come, they were all together in one place. 2 Suddenly a sound like a violent wind blowing came from heaven and filled the entire house where they were sitting. 3 And tongues spreading out like a fire appeared to them and came to rest on each one of them. 4 All of them were filled with the Holy Spirit, and they began to speak in other languages as the Spirit enabled them.
Notes and References
"... There are some early Jewish writings that could show some awareness of or be inspired by the Old Testament image of ‘tongues of fire’ being associated with a divine theophany in a heavenly or earthly temple. The phrase ‘tongues of fire’ also occurs in these Jewish passages. Perhaps a parallel to the fiery ‘tongues’ of Acts 2:3 is 1 Enoch 14:8–25. There Enoch ascends in a vision to the heavenly temple. Enoch comes to the wall of the outer court that was ‘surrounded by tongues of fire’, and he ‘entered into the tongues of fire’ (14:9–10). He then enters through the holy place and is able to peer into the holy of holies, which was ‘built with tongues of fire’ (14:15). Likewise, in 1 Enoch 71:5 Enoch sees a temple-like ‘structure built of crystals; and between those crystals tongues of living fire’. Thus, the ‘tongues of fire’ form part of the heavenly temple and contribute to the overall effect of the burning theophany in the holy of holies, where ‘the flaming fire was around about him, and a great fire stood before him’ ..."
Beale, G. K. The Temple and the Church’s Mission: A Biblical Theology of the Dwelling Place of God (p. 247) InterVarsity Press, 2004