John 12:29

The crowd that was standing around heard this [i.e., the sound of the Father's voice], but said it was thunder. Others said, "An angel spoke to Him [i.e., Jesus]."

Acts 23:8-9

For the Sadducees believe there is no resurrection, angels or spirits, but the Pharisees accept all of them [to be true].

Revelation 6:1

And I watched while the Lamb broke open one of the seven seals. Then I heard one of the four living beings saying in a thunderous voice [to the one on the white horse ?], "Come [out]."

Revelation 8:5

Then the angel took the incense holder and filled it with hot coals from the Altar and threw it to the earth. [Immediately] there was [heard] rolling thunder, and lightning flashes [were seen] and an earthquake [was felt].

Revelation 11:19

Then God's Temple in heaven was opened, and inside of it was seen the Chest containing God's Agreement [i.e., between Him and Israel]. [Immediately] there came lightning flashes, [loud] sounds, rumbling thunder, an earthquake and a severe hailstorm.

Revelation 14:2

And I heard a sound from heaven like the roar of much rushing water, and like the sound of loud thunder. And the sound I heard was like people playing their harps.

Revelation 18:1-2

After these things I saw another angel coming down from heaven. He had great authority, and the earth was illuminated by his splendor.

Treasury of Scripture Knowledge

Summary

The people therefore, that stood by, and heard it, said that it thundered: others said, An angel spake to him.

Bible References

An angel

Acts 23:8
For the Sadducees believe there is no resurrection, angels or spirits, but the Pharisees accept all of them [to be true].
Revelation 18:1
After these things I saw another angel coming down from heaven. He had great authority, and the earth was illuminated by his splendor.