² This is what the Lord says:
Do not learn the way of the nations
or be terrified by signs in the heavens,
although the nations are terrified by them,
³for the customs of the peoples are worthless.
Jeremiah 10:2-3 CSB

In the 5th century, a pope "converted" the Roman festival of Lupercalia [3] to the Feast of Purification, which became our modern Valentine's Day [2]

The massacre I remembered is from 1929; it has nothing to do with the origin of Valentine's Day, though I've definitely had people bring it up when the date is talked about.

Bible verses to reference

• Deuteronomy 14:2
• Revelation 18:4
• 2 Corinthians 6:17
• 2 Corinthians 7:1
• Romans 12:2
• 1 John 2:15-16
• Matthew 6:24
• 2 Corinthians 5:17