When Abraham asked for confirmation of the promise, the Lord did not give him a speech. He gave him a butchery list. Targum Pseudo-Jonathan on Genesis 15:9 preserves it exactly. A heifer of three years. A goat of three years. A ram of three years. A dove. A young pigeon.
Five creatures. Three of them three years old. A covenant is about to be cut, and the pieces matter.
Later tradition reads the animals as a forecast — the great kingdoms that will oppress Abraham's descendants, each pictured as a beast, with Israel as the dove that is not divided. The Targum itself will spell this out a few verses later, naming Bavel, Madai, Javan, and Pheras inside Abraham's deep sleep (Genesis 15:12). Here, though, in verse 9, the vision is still pure instruction: bring Me these.
The Maggid notices the quiet courage of obedience. Abraham does not ask why three years. He does not ask why these species. He does not even ask what is about to happen. He goes to the flock and picks the animals. Revelation often begins like this — not with an explanation but with a list of things to fetch. Belief is first measured in feet, not in words (Genesis 15:9). Abraham walks, and the covenant follows.