First starting in the first book of the Holy Bible which is Genesis, which explains how sin came into the world, and how we all have sinned.

 

In (Genesis 1:1-10) it says that God, In the beginning, created the heaven and the earth. And God saw that it was good. And in (Genesis 1:11,12) It tells that God then brought forth grass, the herb yielding seed, and the fruit tree yielding fruit after his kind, whose seed is in itself, upon the earth: and it was so. And God saw that it was good.

 

And in (Genesis 1:13-18) it says: that God made the evening, morning and divide the day from the night; and let them be for signs, and for seasons, and for days, and years were the third day. And God saw that it was good. In Genesis 1:20-22: And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven. And God saw that it was good.

 

After then in Genesis 1:23-25: God said, Let the earth bring forth the living creature after his kind, cattle, and creeping thing, and beast of the earth after his kind: and it was so. And God saw that it was good. Then last of all in (Genesis 1:26-31) God created man in his own image, in the image of God created he him; created male and female created he them. And God saw everything that he had made, and, behold, it was very good.

 

As you have read, everything God created, in the beginning, was good. And there was no sin in the world because everything God created was good. But as you read in (Genesis 2:8,9) God planted a garden eastward in Eden; and there He put the man whom he had formed. And out of the ground made the LORD God to grow every tree that is pleasant to the sight, and good for food; the tree of life also in the midst of the garden, and the tree of knowledge of good and evil.

 

And in (Genesis 2:16,17) And the LORD God commanded the man, saying, Of every tree of the garden thou mayest freely eat: 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.