Acts 26:15

I answered, 'Who are you, sir?' And the Lord said, 'I am Jesus, the One you are persecuting.

Matthew 25:40

And the King will answer them and say, 'Truly I tell you, since you did all this for one of my least [significant] brothers, you did it for me.'

Matthew 25:45

Then the Lord will answer them, 'Truly I tell you, since you did not do it for one of these least [significant brothers of mine], you did not do it for me.'

John 15:20-21

Remember what I said to you, 'A slave is not greater [in importance] than his master.' If they persecuted me, they will [also] persecute you, too; if they obeyed my teaching, they will obey yours also.

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
And the King will answer them and say, 'Truly I tell you, since you did all this for one of my least [significant] brothers, you did it for me.'
John 15:20
Remember what I said to you, 'A slave is not greater [in importance] than his master.' If they persecuted me, they will [also] persecute you, too; if they obeyed my teaching, they will obey yours also.