Acts 26:15

'Who are you, sir?' said I. The Lord said, 'I am Jesus, whom you are persecuting.

Matthew 25:40

The king will answer, 'I tell you, in so far as you did it to one of the humblest of these brothers of mine, you did it to me.'

Matthew 25:45

Then he will answer, 'I tell you, in so far as you failed to do it for one of these people who are humblest, you failed to do it for me.'

John 15:20-21

Remember what I said to you: No slave is greater than his master. If they have persecuted me they will persecute you too. If they have observed my teaching, they will observe yours too.

Treasury of Scripture Knowledge

Summary

And I said, Who art thou, Lord? And he said, I am Jesus whom thou persecutest.

Bible References

I am

Matthew 25:40
The king will answer, 'I tell you, in so far as you did it to one of the humblest of these brothers of mine, you did it to me.'
John 15:20
Remember what I said to you: No slave is greater than his master. If they have persecuted me they will persecute you too. If they have observed my teaching, they will observe yours too.