Unpardonable sin

1. Jacob 7: 19
   19 And he said: I fear lest I have committed the unpardonable sin, for I have lied unto God; for I denied the Christ, and said that I believed the scriptures; and they truly testify of him. And because I have thus lied unto God I greatly fear lest my case shall be awful; but I confess unto God.
2. Alma 39: 6
   6 For behold, if ye deny the Holy Ghost when it once has had place in you, and ye know that ye deny it, behold, this is a sin which is unpardonable; yea, and whosoever murdereth against the light and knowledge of God, it is not easy for him to obtain forgiveness; yea, I say unto you, my son, that it is not easy for him to obtain a forgiveness.