Continuing the response to the meta call for contradiction.
In Genesis 6:18 we read the following:
And I will make my covenant with you: and those that come on the ark, you and your sons and your wife, and your sons wives with you. And from all that lives, and from all flesh, two of each bring into the ark, to live with you. Male and female they will be. From the birds of their kind, from the beasts to their kind, from all that crawls on the earth to its kind, two of each will come with you, to survive. And you, take for yourself from every food which can be eaten, and gather it to you, and it will be for you and for them, to eat.
And Noah did: Everything he was commanded to by God, so he did.
But right at the beginning of Chapter 7, we read:
And Yahweh said to Noach(Noah): come you and all your household to the ark: because you I see are righteous before me, in this generation.
From every pure beast, take for you seven/seven--- husband and wife; and from the impure beast, two, husband and wife. Also from the fowl of the sky seven/seven, male and female, to survive as seed for the entire Earth. Because in seven days still, shall I rain on the Earth, forty days and forty nights, and I shall wipe the whole expanse which I have made from the face of the land.
And Noah did all that Yahweh had commanded him.
Here is a pure contradiction. How many doves were there on the ark, two or seven?
There is further evidence later, in Chapter 8:
And it was, and the end of forty days, and Noach opened the window of the ark which he made. And he sent the crow; and it went back and forth, until the waters dried above the land.
And he sent the dove from him to see if the waters were lighter on the face of the land. And the dove didn't find rest for her feet, and returned to him, to the ark, because water was over all the land. And he sent his hand and took her, and brought her to him, into the ark.
Both the crow and the dove are referred to using singular indicators, suggesting there was only one of the appropriate gender referred to by the pronoun. This strongly suggests that there was only one crow and only one female dove.
But a crow is impure, while a dove is pure.
Finally, once Noah is on dry land, at the end of Chapter 8, there is the following passage:
And Noah did build an altar for Yahweh; and he took from all the pure beast, and from every pure fowl, and raised smoke in the altar. And Yahweh smelled the comforting smell, and said to himself, no more will I curse the ground on cause of man, because the heart of man has wrong from his adolescence, and no more will I strike all that lives, just as I have done. Onward, all the days of the earth: seeding and reaping and cold and hot, and summer and winter, and night and day, will not arrest.
So Noah is sacrificing of the pure beasts to Yahweh. What gives? Were there seven of the pure beasts, or two, two of each beast?