Genesis 4:8-12

Genesis 4:8-12

[8] And Cain  talked  with  Abel  his brother:  and it came to pass, when they were in the field,  that Cain  rose up  against  Abel  his brother,  and slew him.  [9] And the LORD  said  unto Cain,  Where  is Abel  thy brother?  And he said,  I know  not: Am I my brother's  keeper?  [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 4:8-12?