Genesis 15:6

3 And Abram said, Behold, to me thou hast given no seed: and, lo, one born in my house is mine heir.

4 And, behold, the word of Jehovah came unto him, saying, This man shall not be thine heir; But he that shall come forth out of thine own bowels shall be thine heir.

5 And he brought him forth abroad, and said, Look now toward heaven, and number the stars, if thou be able to number them: and he said unto him, So shall thy seed be.

6 And he believed in Jehovah; and he reckoned it to him for righteousness.

7 And he said unto him, I am Jehovah that brought thee out of Ur of the Chaldees, to give thee this land to inherit it.

8 And he said, O Lord Jehovah, whereby shall I know that I shall inherit it?

9 And he said unto him, Take me a heifer three years old, and a she-goat three years old, and a ram three years old, and a turtle-dove, and a young pigeon.