Hebrews 2:1

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.

Proverbs 3:21

My son, let not them 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 have seen, and lest they depart from thy heart all the days of thy life: but teach them thy sons, and thy sons' sons;

Deuteronomy 4:23

Take heed unto yourselves, lest ye forget the covenant of the LORD your God, which he made with you, and make you a graven image, or the likeness of any thing, which the LORD thy God hath forbidden thee.

Deuteronomy 32:46-47

And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law.

Joshua 23:11-12

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

1 Chronicles 22:13

Then shalt thou prosper, if thou takest heed to fulfil the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.

Psalm 119:9

BETH. Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word.

Proverbs 2:1-6

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

Proverbs 4:1-4

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

Proverbs 4:20-22

My son, attend to my words; incline thine ear unto 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, 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 they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.

Luke 9:44

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

Hebrews 1:1-2

God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,

Hebrews 2:2-4

For if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward;

Hebrews 12:5

And ye have forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked of him:

Hebrews 12:25-26

See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:

2 Peter 1:12-13

Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth.

2 Peter 1:15

Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance.

2 Peter 3:1

This second epistle, beloved, I now write unto you; in both which I stir up your pure minds by way of remembrance:

Habakkuk 1:6

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

Habakkuk 2:16

Thou art filled with shame for glory: drink thou also, and let thy foreskin be uncovered: the cup of the LORD'S right hand shall be turned unto thee, and shameful spewing shall be on 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 angels was stedfast, and every transgression and disobedience received a just recompence of reward;
Hebrews 1:1
God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
Hebrews 12:25
See that ye refuse not him that speaketh. For if they escaped not who refused him that spake on earth, much more shall not we escape, if we turn away from him that speaketh from heaven:

The more

Deuteronomy 4:9
Only 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 thy sons, and thy sons' sons;
Deuteronomy 32:46
And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law.
Joshua 23:11
Take good heed therefore unto yourselves, that ye love the LORD your God.
1 Chronicles 22:13
Then shalt thou prosper, if thou takest heed to fulfil the statutes and judgments which the LORD charged Moses with concerning Israel: be strong, and of good courage; dread not, nor be dismayed.
Psalm 119:9
BETH. Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word.
Proverbs 2:1
My son, if thou wilt receive my words, and hide my commandments with thee;
Proverbs 3:21
My son, let not them depart from thine eyes: keep sound wisdom and discretion:
Proverbs 4:1
Hear, ye children, 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 that on the good ground are they, which in an honest and good heart, having heard the word, keep it, and bring forth fruit with patience.
Luke 9:44
Let these sayings 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 forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked 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
Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth.
2 Peter 3:1
This second epistle, beloved, I now write unto you; in both which I stir up your pure minds by way of remembrance:

Let them slip

Habakkuk 1:6
For, lo, I raise up the Chaldeans, that bitter and hasty nation, which shall march through the breadth of the land, to possess the dwellingplaces that are not theirs.
Habakkuk 2:16
Thou art filled with shame for glory: drink thou also, and let thy foreskin be uncovered: the cup of the LORD'S right hand shall be turned unto thee, and shameful spewing shall be on thy glory.

General references

Exodus 16:32
And Moses said, This is the thing which the LORD commandeth, Fill an omer of it to be kept for your generations; that they may see the bread wherewith 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 thine hand, and they shall be as frontlets between thine eyes.
Deuteronomy 16:9
Seven weeks shalt thou number unto thee: begin to number the seven weeks from such time as thou beginnest to put the sickle to the corn.
Deuteronomy 32:46
And he said unto them, Set your hearts unto all the words which I testify among you this day, which ye shall command your children to observe to do, all the words of this law.

King James Version Public Domain