Hebrews 2:1

Therefore, it is necessary that we with more diligence keep the things which we have heard, so that we do not fall.

Proverbs 3:21

My son, do not let them depart from thine eyes; keep sound wisdom and discretion,

Deuteronomy 4:9

Therefore, take heed to thyself and keep thy soul diligently lest thou forget the things which thine eyes have seen and lest they depart from thy heart all the days of thy life, but teach them to thy sons and thy sons' sons.

Deuteronomy 4:23

Keep yourselves, do not forget the covenant of the LORD your God, which he established with you, and make yourselves a graven image or the likeness of any thing, which the LORD thy God has forbidden thee.

Deuteronomy 32:46-47

and he said unto them, Set your hearts unto all the words which I protest against you today, to command them unto your children and keep and fulfil all the words of this law.

Joshua 23:11-12

Therefore take heed for your souls that ye love the LORD your God.

1 Chronicles 22:13

Then shalt thou be prospered if thou shalt keep thyself to do the statutes and rights which the LORD charged Moses with concerning Israel; be strong and of good courage; dread not, nor be dismayed.

Psalm 119:9

BETH. With what shall a young man cleanse his way? when he shall keep thy word.

Proverbs 2:1-6

My son, if thou wilt receive my words and hide my commandments within thee

Proverbs 4:1-4

Hearken, ye sons, unto the chastening of the father, and pay attention that ye might know understanding.

Proverbs 4:20-22

My son, attend to my words; incline thine ear unto my words.

Proverbs 7:1-2

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

Matthew 16:9

Do ye not yet understand, neither remember the five loaves of the five thousand, and how many baskets ye took up?

Mark 8:18

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

Luke 8:15

But that on the good ground are those who in an honest and good heart, having heard the word, keep it and bring forth fruit with patience.

Luke 9:44

Let these words sink down into your ears, for the Son of man shall be delivered into the hands of men.

Hebrews 1:1-2

God, having spoken many times and in many ways in time past unto the fathers by the prophets,

Hebrews 2:2-4

For if the word spoken by the ministry of angels was steadfast and every rebellion and disobedience received a just recompense of reward,

Hebrews 12:5

And ye have quite forgotten the consolation which speaks unto you as unto sons, My son, despise not thou the chastening of the Lord, nor faint when thou art reproved of him:

Hebrews 12:25-26

See that you do not refuse him that speaks. For if those who refused him that spoke on earth did not escape, much less shall we escape, if we turn away from him that speaks from the heavens,

2 Peter 1:12-13

For this reason, I will not leave off reminding you always of these things, although ye know them and are established in the present truth.

2 Peter 1:15

I will also make sure with diligence that after my decease ye might remember these things.

2 Peter 3:1

Beloved, I now write unto you this second epistle, in which I alert with exhortation your pure understanding,

Habakkuk 1:6

For, behold, I raise up the Chaldeans, that bitter and hasty nation, which march through the breadth of the earth to possess the dwellingplaces that are not theirs.

Habakkuk 2:16

Thou hast filled thyself with dishonour instead of honour; drink thou also, and thy foreskin shall be uncovered; the cup of the LORD's right hand shall be turned unto thee, and shameful vomit shall fall 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 by the ministry of angels was steadfast and every rebellion and disobedience received a just recompense of reward,
Hebrews 1:1
God, having spoken many times and in many ways in time past unto the fathers by the prophets,
Hebrews 12:25
See that you do not refuse him that speaks. For if those who refused him that spoke on earth did not escape, much less shall we escape, if we turn away from him that speaks from the heavens,

The more

Deuteronomy 4:9
Therefore, take heed to thyself and keep thy soul diligently lest thou forget the things which thine eyes have seen and lest they depart from thy heart all the days of thy life, but teach them to thy sons and thy sons' sons.
Deuteronomy 32:46
and he said unto them, Set your hearts unto all the words which I protest against you today, to command them unto your children and keep and fulfil all the words of this law.
Joshua 23:11
Therefore take heed for your souls that ye love the LORD your God.
1 Chronicles 22:13
Then shalt thou be prospered if thou shalt keep thyself to do the statutes and rights which the LORD charged Moses with concerning Israel; be strong and of good courage; dread not, nor be dismayed.
Psalm 119:9
BETH. With what shall a young man cleanse his way? when he shall keep thy word.
Proverbs 2:1
My son, if thou wilt receive my words and hide my commandments within thee
Proverbs 3:21
My son, do not let them depart from thine eyes; keep sound wisdom and discretion,
Proverbs 4:1
Hearken, ye sons, unto the chastening of the father, and pay attention that ye might know understanding.
Proverbs 7:1
My son, keep my words, and lay up my commandments with thee.
Luke 8:15
But that on the good ground are those who in an honest and good heart, having heard the word, keep it and bring forth fruit with patience.
Luke 9:44
Let these words sink down into your ears, for the Son of man shall be delivered into the hands of men.

We should

Hebrews 12:5
And ye have quite forgotten the consolation which speaks unto you as unto sons, My son, despise not thou the chastening of the Lord, nor faint when thou art reproved of him:
Matthew 16:9
Do ye not yet understand, neither remember the five loaves of the five thousand, and how many baskets ye took up?
Mark 8:18
Having eyes, see ye not? and having ears, hear ye not? and do ye not remember?
2 Peter 1:12
For this reason, I will not leave off reminding you always of these things, although ye know them and are established in the present truth.
2 Peter 3:1
Beloved, I now write unto you this second epistle, in which I alert with exhortation your pure understanding,

Let them slip

Habakkuk 1:6
For, behold, I raise up the Chaldeans, that bitter and hasty nation, which march through the breadth of the earth to possess the dwellingplaces that are not theirs.
Habakkuk 2:16
Thou hast filled thyself with dishonour instead of honour; drink thou also, and thy foreskin shall be uncovered; the cup of the LORD's right hand shall be turned unto thee, and shameful vomit shall fall upon thy glory.

General references

Exodus 16:32
And Moses said, This is what the LORD has commanded, Fill an omer of it to be kept for your descendants, that they may see the bread with which I have fed you in the wilderness when I brought you forth from the land of Egypt.
Deuteronomy 6:8
and thou shalt bind them for a sign upon thy hand, and they shall be as frontlets between thy eyes;
Deuteronomy 16:9
Seven weeks shalt thou number unto thee; begin to number the seven weeks from such time as thou shalt begin to put the sickle to the grain.
Deuteronomy 32:46
and he said unto them, Set your hearts unto all the words which I protest against you today, to command them unto your children and keep and fulfil all the words of this law.