Hebrews 12 KJV
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.
To me, this speaks of denying Christ, as some have done for worldly morsals and various pleasures and as we are admonished not to do in these last times....especially when no one will be allowed to buy or sell without bearing some sort of insignia.
Apparently, the day is coming when some who claim to be Christian but have not been born of the Spirit, will deny Christ so that they and/or family may have another meal.
Hebrews addresses not those that deny, but those that were in the fold, enjoying the spiritual gifts and knowledge, but got sloppy and slipped off the path. Particularly chapter 6.