Genesis 15:6

Abram said, “Behold, you have given no children to me: and, behold, one born in my house is my heir.”

Behold, the LORD’s word came to him, saying, “This man will not be your heir, but he who will come out of your own body will be your heir.”

The LORD brought him outside, and said, “Look now toward the sky, and count the stars, if you are able to count them.” He said to Abram, “So your offspring will be.”

He said to Abram, “I am the LORD who brought you out of Ur of the Chaldees, to give you this land to inherit it.”

He said, “Lord GOD, how will I know that I will inherit it?”

He said to him, “Bring me a heifer three years old, a female goat three years old, a ram three years old, a turtledove, and a young pigeon.”