1 Corinthians 11:19
for there must be sects among you, that the approved may be made known among you.
Matthew 24:24
For false Christs and false prophets will arise, and will show great signs and wonders, so as to deceive, if possible, even the elect.
Acts 17:11
These were of a better disposition than those in Thessalonica, for they received the word with all readiness of mind, examining the Scriptures daily, whether these things were so.
2 Corinthians 8:8
I do not speak this as a commandment, but on account of the zeal of others, and to prove the sincerity of your love.
Ephesians 4:14
that we might no longer be children, tossed and carried about by every wind of teaching, through the artifice of men, through craftiness used by them for the deliberate planning of deceit;
2 Thessalonians 2:11
And for this reason God will send them strong delusion, in order that they may believe a lie,
1 John 2:19
They went out from us, but they were not of us: for, if they had been of us, they would have remained with us; but they went out, that they might be made manifest that they were not all of us.
1 John 4:1
Beloved, believe not every spirit; but prove the spirits, whether they are from God: for many false prophets have gone out into the world.
1 John 4:4
You are of God, little children, and have overcome them; because he that is in you, is greater than he that is in the world.
Revelation 13:14
And he deceives those who dwell on the earth, by means of the signs which he is allowed to do in the presence of the beast, saying to those who dwell on the earth, that they should make an image for the beast which had the wound by the sword, and did live.