In 2 Thessalonians 2:11-12 from the New Testament of the Bible, it is written:
"For this reason God sends them a powerful delusion so that they will believe the lie and so that all will be condemned who have not believed the truth but have delighted in wickedness."
These verses are part of a passage where the Apostle Paul is warning the Thessalonian Christians about the coming of the "man of lawlessness" or the "son of perdition," commonly associated with the Antichrist. The context suggests that this figure will be associated with deception and falsehood.
The "strong delusion" mentioned in these verses is understood to be a divine act of allowing people to believe falsehood willingly, particularly those who have rejected the truth and embraced wickedness. It is not explicitly stated what this delusion will be, but it can be interpreted as a result of the choices and actions of those who have turned away from God and embraced sinful ways.
In the broader theological context, this passage emphasizes the importance of believing in and adhering to the truth and righteousness, rather than falling into deception and wickedness. It is seen as a warning against being swayed by false teachings or following leaders who promote falsehood and lead people away from God's truth.
It's worth noting that interpretations of biblical texts can vary among different religious traditions and scholars, so there may be diverse perspectives on the exact nature of the "strong delusion" mentioned in these verses.