Condensed Biblical Cyclopedia
Primitive SacrificesIt is evident that the Bible does not record all that was Communicated to man; however, the careful student sees that sacrificial Worship was a Divine revelation. The statements that Cain BROUGHT and Abel BROUGHT their respective sacrifices, may indicate that there was a Specific time and place where offerings were presented to God (Genesis 4:1-4). In addition to this, we learn that Abel offered his sacrifice by faith, (Hebrews 11:4), and that faith comes by hearing the word of God (Romans 10:17); that Cain sinned (Genesis 4:7; is the transgression of the law (1 John 3:4).
Strong's Hebrew
6999. qatar -- to make sacrifices smoke... up 
sacrifices (1), perfumed (1), smoke (5), surely burn (1). burn incense, sacrifice
 upon, altar for incense, kindle, offer incense, a sacrifice. A 
primitive ... /hebrew/6999.htm - 6k 2076. zabach -- to slaughter for sacrifice
... 2), sacrifice (47), sacrificed (33), sacrifices (3), sacrificing (9), slaughter
 (3), slaughtered (3). kill, offer, do sacrifice, slay. A primitive root; to ... 
/hebrew/2076.htm - 6k
 1878. dashen -- to be fat, grow fat
... A primitive root; to be fat; transitively, to fatten (or regard as ... satisfy;
 denominatively (from deshen) to remove (fat) ashes (of sacrifices) -- accept, anoint ... 
/hebrew/1878.htm - 6k