29 The crowd that stood by and heard it, said that there had been thunder. Others said, "An angel spoke to him."
John 12:29 Cross References - WNT
Acts 23:8-9
8 For the Sadducees maintain that there is no resurrection, and neither angel nor spirit; but the Pharisees acknowledge the existence of both.
9 So there arose a great uproar; and some of the Scribes belonging to the sect of the Pharisees sprang to their feet and fiercely contended, saying, "We find no harm in the man. What if a spirit has spoken to him, or an angel----!"
Revelation 6:1
1 And when the Lamb broke one of the seven seals I saw it, and I heard one of the four living creatures say, as if in a voice of thunder, "Come."
Revelation 8:5
5 So the angel took the censer and filled it with fire from the altar and flung it to the earth; and there followed peals of thunder, and voices, and flashes of lightning, and an earthquake.
Revelation 11:19
19 Then the doors of God's sanctuary in Heaven were opened, and the Ark, in which His Covenant was, was seen in His sanctuary; and there came flashes of lightning, and voices, and peals of thunder, and an earthquake, and heavy hail.
Revelation 14:2
2 And I heard music from Heaven which resembled the sound of many waters and the roar of loud thunder; and the music which I heard was like that of harpists playing upon their harps.
Revelation 18:1-2
1 After these things I saw another angel coming down from Heaven, armed with great power. The earth shone with his splendor,
2 and with a mighty voice he cried out, saying, "Great Babylon has fallen, has fallen, and has become a home for demons and a stronghold for every kind of foul spirit and for every kind of foul and hateful bird.