Genesis 5 marks a transition. While Genesis 4 primarily discusses Cain's descendants, Genesis 5 describes Seth's descendants. The first two verses of Genesis 5 provide an introduction to Seth's genealogy, beginning with his father Adam:
This is the book of the generations of Adam. (Genesis 5:1)All people, regardless of their gender or nationality, can find their earliest descendants in this genealogy. Adam was a real and historical figure, the first father of every person— for God made from one man every nation of mankind to live on all the face of the earth (Acts 17:26).
The next part of Genesis 5:1 is similar to what God said in Genesis 1:26, "Let Us make man in Our image, according to Our likeness" (Genesis 1:26):
In the day when God created man, He made him in the likeness of God. (Genesis 5:1)First, notice the word "day". God created man on the sixth day of creation. It was no evolutionary process. No purely natural process can form an eternal being made in the image of God. Men are not animals. There is more to man than a physical body. Men are unique spiritual beings who have the ability to reason and think. They are able to express emotion and appreciate beauty.
He created them male and female, and He blessed them and named them Man in the day when they were created. (Genesis 5:2)Like the previous statement, this verse also reminds the reader of man's uniqueness. After God blessed man at creation, He commanded men, "Be fruitful and multiply, and fill the earth... (Genesis 1:28). Men were obedient to this command and thus a genealogy was needed in order to record the lineage of man. This genealogy takes up the rest of Genesis 5 and reveals incredibly important information regarding both the age of the earth and the longevity of our earliest ancestors.
Man in the Image of Man - Genesis 5:3
The Birth of Seth - Genesis 4:25
Righteous Men of the Pre-Flood World - Genesis 4:26
Creation of Man - The Christian Worldview
Summary of Genesis 4