If you are refering to man's first original sin, then it was Eve telling a lie. Here it is to prove my point:
[font=Arial, Geneva, Helvetica]3:1 Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden? [/font]
[font=Arial, Geneva, Helvetica]3:2 And the woman said unto the serpent, We may eat of the fruit of the trees of the garden: [/font]
3:3 But of the fruit of the tree which is in the midst of the garden, God hath said, Ye shall not eat of it, neither shall ye touch it, lest ye die. (Gen. 3:1-3)
Here's what God actually said:
[font=Arial, Geneva, Helvetica]2:16 And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat: [/font]
2:17 But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die. (Gen. 2:16-17)
Eve lied to the serpent first! Before she took of the fruit and eat of it. God never said they couldn't touch it, no, they could not eat of it.