Sound
When Mary's voice reached Elizabeth's ears, she and her unborn baby rejoiced because the mother of their Lord had arrived. In Biblical times, sounding a trumpet blast could signify war or a great celebration. When the last trumpet sounds, the fulfillment of prophecies concerning the return of Christ and the end of the world are imminent.

The word sound is also used in the Bible to refer to something healthy or without flaw. For example, just as having a healthy, or sound, frame of mind is key to writing a valid will, likewise, having a sound understanding of what the Bible truly teaches helps us identify when someone is not teaching the truth (see Truth). A correct knowledge of the truth guides our hearts and minds in discerning the subtle, but critical, differences between truth and falsehood.

Learn the sound teachings of the Bible so that you won't believe anything else.
Colossians 2:4
1 Timothy 6:3-5
2 Timothy 1:13
Titus 1:9; 2:1-2
Use sound judgment before making a decision; sound judgment belongs to God.
Proverbs 3:21; 8:14
Zechariah 8:16
At the end of the world, and angel will sound a trumpet that precedes Jesus Christ's return to the earth.
1 Corinthians 14:8
Revelation 10:7