Genesis 4:10-12

Genesis 4:10-12

[10] And he said,  What  hast thou done?  the voice  of thy brother's  blood  crieth  unto me from the ground.  [11] And now art thou cursed  from the earth,  which hath opened  her mouth  to receive  thy brother's  blood  from thy hand;  [12] When  thou tillest  the ground,  it shall not henceforth  yield  unto thee her strength;  a fugitive  and a vagabond  shalt thou be in the earth. 

What is the context of Genesis 4:10-12?