Jude 1:5

Now I want to remind you, though you know it all already, that although the Lord had saved a people out of the land of Egypt, He afterward destroyed those who did not believe.

2 Peter 3:1

This is the second letter, dearly beloved, that I have already written to you, in both of which I am trying by reminders to stir up your unsullied minds

Romans 15:15

And yet, to refresh your memories, I have written you rather freely on some details, because of the unmerited favor shown me by God

1 Corinthians 10:1-12

For I would not have you, brothers, to be ignorant of the fact that though our forefathers were all made safe by the cloud, and all went securely through the sea, and in the cloud and the sea

Hebrews 3:16-2

For who was it that heard and yet provoked Him? Was it not all who came out of Egypt led by Moses?

2 Peter 1:12-13

Therefore, I will always remind you of these things, although you know them and are firmly grounded in the truth that you already have.

Treasury of Scripture Knowledge

Summary

I will therefore put you in remembrance, though ye once knew this, how that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not.

Bible References

Having

1 Corinthians 10:1
For I would not have you, brothers, to be ignorant of the fact that though our forefathers were all made safe by the cloud, and all went securely through the sea, and in the cloud and the sea

Afterward

Hebrews 3:16
For who was it that heard and yet provoked Him? Was it not all who came out of Egypt led by Moses?
Hebrews 4:1
So let us fear that when the promise for us to be admitted to His rest is still remaining valid some one of you may be found to have missed it.

General references

Matthew 25:2
Now five of them were thoughtless and five were thoughtful,
1 Corinthians 10:5
still with the most of them God was not at all satisfied, for He allowed them to be laid low in the desert.
1 Timothy 5:15
For some widows have already turned aside to follow Satan.
Hebrews 3:19
So we see that it was because of their unbelief that they could not be admitted to it.