Moses
Genesis 15:10ESV·traditional attribution

And he brought him all these, cut them in half, and laid each half over against the other. But he did not cut the birds in half.

John Calvin Reformed @genevareformer

10. And divided them in the midst . That no part of this sacrifice may be without mystery, certain interpreters weary themselves in the fabrication of subtleties; but it is our business, as I have often declared, to cultivate sobriety.

Matthew Henry Presbyterian @wholebiblehenry

We have here the assurance given to Abram of the land of Canaan for an inheritance. I. God declares his purpose concerning it, Gen 15:7. Observe here, Abram made no complaint in this matter, as he had done for the want of a child. Note, Those that are sure of an interest in the promised seed will see no reason to doubt of a title to the promised land.

Commenting on Genesis 15:7-11

John Gill Reformed Baptist @doctorgill

And when the fowls came down upon the carcasses,.... Upon the birds, as Aben Ezra and Ben Melech interpret it, whose carcasses were whole; or rather upon the divided carcasses of the animals, and indeed on both: this is to be understood of birds of prey, as eagles, vultures, kites, crows, &c.