Acts 17:30

the times, indeed, therefore, of the ignorance God having overlooked, doth now command all men everywhere to reform,

Luke 24:47

and reformation and remission of sins to be proclaimed in his name to all the nations, beginning from Jerusalem:

Acts 14:16

who in the past generations did suffer all the nations to go on in their ways,

Romans 3:25

whom God did set forth a mercy seat, through the faith in his blood, for the shewing forth of His righteousness, because of the passing over of the bygone sins in the forbearance of God --

Mark 6:12

And having gone forth they were preaching that men might reform,

Titus 2:11-12

For the saving grace of God was manifested to all men,

Matthew 4:17

From that time began Jesus to proclaim and to say, 'Reform ye, for come nigh hath the reign of the heavens.'

Acts 11:18

And they, having heard these things, were silent, and were glorifying God, saying, 'Then, indeed, also to the nations did God give the reformation to life.'

Acts 17:23

for passing through and contemplating your objects of worship, I found also an erection on which had been inscribed: To God -- unknown; whom, therefore -- not knowing -- ye do worship, this One I announce to you.

Acts 20:21

testifying fully both to Jews and Greeks, toward God reformation, and faith toward our Lord Jesus Christ.

Romans 3:23

for all did sin, and are come short of the glory of God --

2 Corinthians 7:10

for the sorrow toward God reformation to salvation not to be repented of doth work, and the sorrow of the world doth work death,

1 Peter 4:3

for sufficient to us is the past time of life the will of the nations to have wrought, having walked in lasciviousnesses, desires, excesses of wines, revellings, drinking-bouts, and unlawful idolatries,

Psalm 50:21

These thou didst, and I kept silent, Thou hast thought that I am like thee, I reprove thee, and set in array before thine eyes.

Matthew 3:2

and saying, 'Reform, for come nigh hath the reign of the heavens,'

Mark 1:15

and saying -- 'Fulfilled hath been the time, and the reign of God hath come nigh, reform ye, and believe in the good news.'

Luke 13:5

No -- I say to you, but, if ye may not reform, all ye in like manner shall perish.'

Luke 15:10

'So I say to you, joy doth come before the messengers of God over one sinner reforming.'

Acts 3:19

reform ye, therefore, and turn back, for your sins being blotted out, that times of refreshing may come from the presence of the Lord,

Acts 26:17-20

delivering thee from the people, and the nations, to whom now I send thee,

Romans 1:28

And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;

Romans 2:4

or the riches of His goodness, and forbearance, and long-suffering, dost thou despise? -- not knowing that the goodness of God doth lead thee to reformation!

Ephesians 4:17-32

This, then, I say, and I testify in the Lord; ye are no more to walk, as also the other nations walk, in the vanity of their mind,

Ephesians 5:6-8

Let no one deceive you with vain words, for because of these things cometh the anger of God upon the sons of the disobedience,

1 Peter 1:14-15

as obedient children, not fashioning yourselves to the former desires in your ignorance,

Treasury of Scripture Knowledge

Summary

And the times of this ignorance God winked at; but now commandeth all men every where to repent:

Bible References

The times

Acts 14:16
who in the past generations did suffer all the nations to go on in their ways,
Psalm 50:21
These thou didst, and I kept silent, Thou hast thought that I am like thee, I reprove thee, and set in array before thine eyes.
Romans 1:28
And, according as they did not approve of having God in knowledge, God gave them up to a disapproved mind, to do the things not seemly;
Romans 3:23
for all did sin, and are come short of the glory of God --

General references

Numbers 15:27
'And if one person sin in ignorance, then he hath brought near a she-goat, daughter of a year, for a sin-offering;
Ecclesiastes 12:14
For every work doth God bring into judgment, with every hidden thing, whether good or bad.'
Luke 5:32
I came not to call righteous men, but sinners, to reformation.'