Genesis 1:27 stands within the first creation account, where the repeated declaration that God saw His work as good reaches a distinctive point in the making of humanity. The verse does not present human beings as self-created, accidental, or independent of their Maker. Three times it identifies God as the one who created humanity, and it describes human beings as made in the image of God, with male and female included in that created calling. The verse is brief, but its place in Genesis 1 gives it weight: humanity belongs within God’s ordered world and receives its identity from Him.
Genesis 3:15 is spoken after the serpent’s deception, the woman’s disobedience, and the man’s participation in eating what God had forbidden. The verse belongs to God’s judgment on the serpent and describes continuing hostility between the serpent and the woman, and between their respective offspring. It does not remove the consequences announced in the surrounding verses: pain, toil, alienation, and death remain part of the chapter’s account of life east of Eden. Yet judgment is not the whole word spoken in Genesis 3. Within the judgment is a promise that the serpent will not have the final victory.
Genesis 15:6 appears in a chapter where Abram is facing a tension between God’s promise and his visible circumstances. God has already promised descendants and a land, but Abram remains childless and openly asks how the promise can be fulfilled. The Lord responds by directing his attention beyond his household and reaffirming that his own son will be his heir. The verse then records Abram’s response: he believes the Lord, and that faith is counted to him as righteousness.
Genesis 50:20 is Joseph’s response to his brothers near the end of Genesis. Their father, Jacob, has died, and the brothers fear that Joseph will now retaliate for the evil they committed when they sold him into slavery. Joseph acknowledges their intention plainly: they meant harm against him. He then distinguishes their action from God’s purpose, saying that God meant the same chain of events for good, with the preservation of many lives as a result.