many.

Mark 13:22
For false Christs and false prophets will appear and perform signs and wonders that would deceive even the elect, if that were possible.

Jeremiah 14:14
"The prophets are prophesying lies in My name, " the LORD replied. "I did not send them or appoint them or speak to them. They are prophesying to you a false vision, a worthless divination, the futility and delusion of their own minds.

Jeremiah 23:21-25
I did not send these prophets, yet they have run with their message; I did not speak to them, yet they prophesied. . . .

John 5:43
I have come in My Father's name, and you have not received Me; but if someone else comes in his own name, you will receive him.

1 John 4:1
Beloved, do not believe every spirit, but test the spirits to see whether they are from God. For many false prophets have gone out into the world.

and shall.

Mark 13:22
For false Christs and false prophets will appear and perform signs and wonders that would deceive even the elect, if that were possible.

Matthew 24:5, 11, 23, 24
For many will come in My name, claiming, 'I am the Christ, ' and will deceive many. . . .

Acts 5:36-39
Some time ago Theudas rose up, claiming to be somebody, and about four hundred men joined him. He was killed, all his followers were dispersed, and it all came to nothing. . . .