Here are 4 Bible verses about deception in the end times from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
2 Thessalonians 2:3 KJV
Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
Matthew 24:24 KJV
For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
2 Timothy 4:3-4 KJV
For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears; And they shall turn away their ears from the truth, and shall be turned unto fables.
1 Timothy 4:1 KJV
Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;