Thematic Bible: By offering a sacrifice

And He said to him, Bring to Me a heifer three years old, a she-goat three years old, a ram three years old, a turtledove, and a young pigeon. And he brought Him all these and cut them down the middle [into halves] and laid each half opposite the other; but the birds he did not divide. And when the birds of prey swooped down upon the carcasses, Abram drove them away. read more.
When the sun was setting, a deep sleep overcame Abram, and a horror (a terror, a shuddering fear) of great darkness assailed and oppressed him. And [God] said to Abram, Know positively that your descendants will be strangers dwelling as temporary residents in a land that is not theirs [Egypt], and they will be slaves there and will be afflicted and oppressed for 400 years. But I will bring judgment on that nation whom they will serve, and afterward they will come out with great possessions. And you shall go to your fathers in peace; you shall be buried at a good old (hoary) age. And in the fourth generation they [your descendants] shall come back here [to Canaan] again, for the iniquity of the Amorites is not yet full and complete. When the sun had gone down and a [thick] darkness had come on, behold, a smoking oven and a flaming torch passed between those pieces.

And the men who have transgressed My covenant, who have not kept the terms of the covenant or solemn pledge which they had made before Me, I will make them [like] the [sacrificial] calf which they cut in two and then passed between its separated parts [solemnizing their pledge to Me] -- "I will make those men the calf! The princes of Judah, the princes of Jerusalem, the eunuchs, the priests, and all the people of the land who passed between the parts of the calf,