King James Version (KJV) Authorized Version 1611
Read Full Chapter (Hebrews 12)

Hebrews 12:15-16 KJV

"Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and there by many be defiled; Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright."
Hebrews Chapter 12, Verse 15-16

Hebrews 12:15-16 in Context (Verses 12–19 KJV)

12
Wherefore lift up the hands which hang down, and the feeble knees;
13
And make straight paths for your feet, lest that which is lame be turned out of the way; but let it rather be healed.
14
Follow peace with all men, and holiness, without which no man shall see the Lord:
15
Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;
16
Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright.
17
For ye know how that afterward, when he would have inherited the blessing, he was rejected: for he found no place of repentance, though he sought it carefully with tears.
18
For ye are not come unto the mount that might be touched, and that burned with fire, nor unto blackness, and darkness, and tempest,
19
And the sound of a trumpet, and the voice of words; which voice they that heard intreated that the word should not be spoken to them any more: