Cast out the bondwoman gen 21.10

KJV 
²¹ Tell me, ye that desire to be under the law, do ye not hear the law?
²² For it is written, that Abraham had two sons, the one by a bondmaid, the other by a freewoman.
²³ But he who was of the bondwoman was born after the flesh; but he of the freewoman was by promise.
²⁴ Which things are an allegory: for these are the two covenants; the one from the mount Sinai, which gendereth to bondage, which is Agar.
²⁵ For this Agar is mount Sinai in Arabia, and answereth to Jerusalem which now is, and is in bondage with her children.
²⁶ But Jerusalem which is above is free, which is the mother of us all.
²⁷ For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband.
²⁸ Now we, brethren, as Isaac was, are the children of promise.
²⁹ But as then he that was born after the flesh persecuted him that was born after the Spirit, even so it is now.
³⁰ Nevertheless what saith the scripture? Cast out the bondwoman and her son: for the son of the bondwoman shall not be heir with the son of the freewoman.
³¹ So then, brethren, we are not children of the bondwoman, but of the free.




  Genesis 4:1   And Adam knew Eve his wife; and she conceived, and bare Cain, and said, I have gotten a man from the LORD.





  Genesis 21.10:Wherefore she said unto Abraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac.

a message from the book of mormon
3 nephi 6 

17 And thus, in the commencement of the thirtieth year—the people having been delivered up for the space of a long time to be carried about by the temptations of the devil whithersoever he desired to carry them, and to do whatsoever iniquity he desired they should—and thus in the commencement of this, the thirtieth year, they were in a state of awful wickedness.

18 Now they did not sin ignorantly, for they knew the will of God concerning them, for it had been taught unto them; therefore they did wilfully rebel against God.