Hebrews 2:1

Because of this we ought to give more earnest heed to the things that were heard, lest we might slip away.

Proverbs 3:21

My son, let them not depart from thine eyes. Keep sound wisdom and discretion,

Deuteronomy 4:9

Only take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes saw, and lest they depart from thy heart all the days of thy life, but make them known to thy sons and thy son's sons--

Deuteronomy 4:23

Take heed to yourselves, lest ye forget the covenant of LORD your God, which he made with you, and make you a graven image in the form of anything which LORD thy God has forbidden thee.

Deuteronomy 32:46-47

And he said to them, Set your heart to all the words which I testify to you this day, which ye shall command your sons to observe to do, [even] all the words of this law.

Joshua 23:11-12

Take good heed therefore to yourselves, that ye love LORD your God.

1 Chronicles 22:13

Then thou shall prosper, if thou observe to do the statutes and the ordinances which LORD charged Moses with concerning Israel. Be strong, and of good courage. Fear not, neither be dismayed.

Psalm 119:9

With what shall a young man cleanse his way? By taking heed according to thy word.

Proverbs 2:1-6

My son, if thou will receive my words, and lay up my commandments with thee,

Proverbs 4:1-4

Hear, ye sons, the instruction of a father, and attend to know understanding.

Proverbs 4:20-22

My son, attend to my words. Incline thine ear to my sayings.

Proverbs 7:1-2

My son, keep my words, and lay up my commandments with thee.

Matthew 16:9

Do ye not yet understand, nor remember the five loaves of the five thousand, and how many baskets ye took up,

Mark 8:18

Having eyes, ye see not, and having ears, ye hear not? And do ye not remember?

Luke 8:15

But those in the good ground, these are those who in an good and right heart, having heard the word, hold it firm, and bring forth fruit in perseverance.

Luke 9:44

Place ye these sayings into your ears, for the Son of man is going to be delivered up into the hands of men.

Hebrews 1:1-2

God, who formerly spoke in many portions and in many ways to the fathers by the prophets, spoke to us in these last days by a Son,

Hebrews 2:2-4

For if the word spoken through heavenly agents became certain, and every transgression and disobedience received a just recompense of reward,

Hebrews 12:5

And have ye forgotten the exhortation that reasons with you as with sons, My son, do not disparage the chastening of Lord, nor become disheartened when punished by him?

Hebrews 12:25-26

Watch, that ye not refuse him who speaks. For if those men did not escape, having refused him who spoke a divine message on earth, much more we, those who turn away from him from the heavens,

2 Peter 1:12-13

Therefore I will not neglect to always remind you about these things, although having known them, and having been established in the present truth.

2 Peter 1:15

And also I will endeavor for you to always have, after my departure, the memory of these things to apply.

2 Peter 3:1

I write to you now this second letter, beloved, in which I arouse your sincere mind by a reminder,

Habakkuk 1:6

For, lo, I raise up the Chaldeans, that bitter and hasty nation, who march through the breadth of the earth to possess dwelling-places that are not theirs.

Habakkuk 2:16

Thou are filled with shame, and not glory. Drink thou also, and be as one uncircumcised. The cup of LORD's right hand shall come around to thee, and foul shame shall be upon thy glory.

Treasury of Scripture Knowledge

Summary

Therefore we ought to give the more earnest heed to the things which we have heard, lest at any time we should let them slip.

Let them slip

Bible References

Therefore

Hebrews 2:2
For if the word spoken through heavenly agents became certain, and every transgression and disobedience received a just recompense of reward,
Hebrews 1:1
God, who formerly spoke in many portions and in many ways to the fathers by the prophets, spoke to us in these last days by a Son,
Hebrews 12:25
Watch, that ye not refuse him who speaks. For if those men did not escape, having refused him who spoke a divine message on earth, much more we, those who turn away from him from the heavens,

The more

Deuteronomy 4:9
Only take heed to thyself, and keep thy soul diligently, lest thou forget the things which thine eyes saw, and lest they depart from thy heart all the days of thy life, but make them known to thy sons and thy son's sons--
Deuteronomy 32:46
And he said to them, Set your heart to all the words which I testify to you this day, which ye shall command your sons to observe to do, [even] all the words of this law.
Joshua 23:11
Take good heed therefore to yourselves, that ye love LORD your God.
1 Chronicles 22:13
Then thou shall prosper, if thou observe to do the statutes and the ordinances which LORD charged Moses with concerning Israel. Be strong, and of good courage. Fear not, neither be dismayed.
Psalm 119:9
With what shall a young man cleanse his way? By taking heed according to thy word.
Proverbs 2:1
My son, if thou will receive my words, and lay up my commandments with thee,
Proverbs 3:21
My son, let them not depart from thine eyes. Keep sound wisdom and discretion,
Proverbs 4:1
Hear, ye sons, the instruction of a father, and attend to know understanding.
Proverbs 7:1
My son, keep my words, and lay up my commandments with thee.
Luke 8:15
But those in the good ground, these are those who in an good and right heart, having heard the word, hold it firm, and bring forth fruit in perseverance.
Luke 9:44
Place ye these sayings into your ears, for the Son of man is going to be delivered up into the hands of men.

We should

Hebrews 12:5
And have ye forgotten the exhortation that reasons with you as with sons, My son, do not disparage the chastening of Lord, nor become disheartened when punished by him?
Matthew 16:9
Do ye not yet understand, nor remember the five loaves of the five thousand, and how many baskets ye took up,
Mark 8:18
Having eyes, ye see not, and having ears, ye hear not? And do ye not remember?
2 Peter 1:12
Therefore I will not neglect to always remind you about these things, although having known them, and having been established in the present truth.
2 Peter 3:1
I write to you now this second letter, beloved, in which I arouse your sincere mind by a reminder,

Let them slip

Habakkuk 1:6
For, lo, I raise up the Chaldeans, that bitter and hasty nation, who march through the breadth of the earth to possess dwelling-places that are not theirs.
Habakkuk 2:16
Thou are filled with shame, and not glory. Drink thou also, and be as one uncircumcised. The cup of LORD's right hand shall come around to thee, and foul shame shall be upon thy glory.

General references

Exodus 16:32
And Moses said, This is the thing which LORD has commanded. Let an omerful of it be kept throughout your generations, that they may see the bread with which I fed you in the wilderness, when I brought you forth from the land of Egy
Deuteronomy 6:8
And thou shall bind them for a sign upon thy hand, and they shall be for frontlets between thine eyes.
Deuteronomy 16:9
Thou shall number to thee seven weeks. From the time thou begin to put the sickle to the standing grain thou shall begin to number seven weeks.
Deuteronomy 32:46
And he said to them, Set your heart to all the words which I testify to you this day, which ye shall command your sons to observe to do, [even] all the words of this law.