A "sign of the times" is something that shows the kinds of things that are happening, popular, important, etc., in a culture at a particular period in history.. In the Bible, the Pharisees and Sadducees requested a sign from Jesus in their misled disbelief of His divinity.
See Jeremiah 31:31-34 and Luke 22:14-23. This is language first used in Jeremiah's promise of rescue and renewal of the exiled people of God...
“You shall not charge interest on loans to your brother, interest on money, interest on food, interest on anything that is lent for interest....
“All the paths of the Lord are mercy and truth, to such as keep His covenant and His testimonies.” Psalm 25:10. “But You, O...