Hebrews 12:15-17

Living_Oracles(i) 15 carefully observing, lest any one come short of the favor of God; lest some bitter root springing up, trouble you, and by it many be polluted; 16 lest there be any fornicator, or profane person, as Esau; who, for one meal, gave away his birthrights. 17 And you know, that although afterward he wished to inherit the blessing, he was reprobated: for he found no scope for effecting a change, though he earnestly sought it with tears.