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."

Cross References (ranked by relevance)

Luke 8:15 35

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.

Deuteronomy 4:9 22

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;

2 Peter 3:1 20

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

2 Peter 1:15 17

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

Proverbs 3:21 15

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

Psalm 119:9 14

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

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.

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?

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.

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.

Luke 9:44

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