1 Timothy 1:13

though I once used to blaspheme, and to persecute, and to insult. Yet mercy was shown me, because I acted in ignorance, while still an unbeliever;

Acts 8:3

But Saul began to devastate the Church; he entered house after house, dragged out men and women alike, and threw them into prison.

Acts 3:17

And yet, my Brothers, I know that you acted as you did from ignorance, and your rulers also.

Luke 12:47

The servant who knows his master's wishes and yet does not prepare and act accordingly will receive many lashes;

Luke 23:34

[Then Jesus said: "Father, forgive them; they do not know what they are doing."] His clothes they divided among them by casting lots.

John 9:39-41

And Jesus added: "It was to put men to the test that I came into this world, in order that those that cannot see should see, and that those that can see should become blind."

Acts 9:1

Meanwhile Saul, still breathing murderous threats against the disciples of the Lord, went to the High Priest,

Acts 9:5

"Who are you, Lord?" he asked. "I am Jesus, whom you are persecuting," the voice answered;

Acts 9:13

"Lord," exclaimed Ananias, "I have heard from many people about this man--how much harm he has done at Jerusalem to your People there.

Acts 22:4

In my persecution of this Cause I did not stop even at the taking of life. I put in chains, and imprisoned, men and women alike--

Acts 26:9-11

I myself, it is true, once thought it my duty to oppose in every way the Name of Jesus of Nazareth;

Romans 5:20-21

Law was introduced in order that offences might be multiplied. But, where sins were multiplied, the loving-kindness of God was lavished the more,

Romans 11:30-31

Just as you at one time were disobedient to him, but have now found mercy in the day of their disobedience;

1 Corinthians 7:25

With regard to unmarried women, I have no command from the Master to give you, but I tell you my opinion, and it is that of a man whom the Master in his mercy has made worthy to be trusted.

1 Corinthians 15:9

For I am the meanest of the Apostles, I who am unworthy of the name of 'Apostle,' because I persecuted the Church of God.

Galatians 1:13

You heard, no doubt, of my conduct when I was devoted to Judaism--how I persecuted the Church of God to an extent beyond belief, and made havoc of it,

Philippians 3:6

As to zeal, I was a persecutor of the Church; as to such righteousness as is due to Law, I proved myself blameless.

1 Timothy 1:16

Yet mercy was shown me for the express purpose that Christ Jesus might exhibit in my case, beyond all others, his exhaustless patience, as an example for those who were afterwards to believe on him and attain Immortal Life.

Hebrews 4:16

Therefore, let us draw near boldly to the Throne of Love, to find pity and love for the hour of need.

Hebrews 6:4-8

For if those who were once for all brought into the Light, and learned to appreciate the gift from Heaven, and came to share in the Holy Spirit,

Hebrews 10:26-29

Remember, if we sin willfully after we have gained a full knowledge of the Truth, there can be no further sacrifice for sin;

1 Peter 2:10

Once you were 'not a people,' but now you are 'God's People'; once you 'had not found mercy,' but now you 'have found mercy.'

2 Peter 2:21-22

It would, indeed, have been better for them not to have known the Way of Righteousness, than, after knowing it, to turn away from the holy Command delivered to them.

Treasury of Scripture Knowledge

Summary

Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief.

Bible References

Was

Acts 8:3
But Saul began to devastate the Church; he entered house after house, dragged out men and women alike, and threw them into prison.
Acts 9:1
Meanwhile Saul, still breathing murderous threats against the disciples of the Lord, went to the High Priest,
Acts 22:4
In my persecution of this Cause I did not stop even at the taking of life. I put in chains, and imprisoned, men and women alike--
Acts 26:9
I myself, it is true, once thought it my duty to oppose in every way the Name of Jesus of Nazareth;
1 Corinthians 15:9
For I am the meanest of the Apostles, I who am unworthy of the name of 'Apostle,' because I persecuted the Church of God.
Galatians 1:13
You heard, no doubt, of my conduct when I was devoted to Judaism--how I persecuted the Church of God to an extent beyond belief, and made havoc of it,
Philippians 3:6
As to zeal, I was a persecutor of the Church; as to such righteousness as is due to Law, I proved myself blameless.

General references

Mark 2:10
But that you may know that the Son of Man has power to forgive sins on earth"--here he said to the paralyzed man--
Luke 12:10
Every one who shall say anything against the Son of Man will be forgiven, but for him who slanders the Holy Spirit there will be no forgiveness.
Luke 19:10
The Son of Man has come to 'search for those who are lost' and to save them."
John 16:9
As to Sin, for men do not believe in me;
Acts 8:3
But Saul began to devastate the Church; he entered house after house, dragged out men and women alike, and threw them into prison.