From the early Church Fathers to now.
2 Jewish · 1 Catholic
“And the unicorns shall go down with them, and the bulls with the mighty: their land shall be soaked with blood, and their ground with the fat of fat ones.”
“wild oxen with them Kings with governors, wild oxen with the goats mentioned above. fat bulls (אַבִּירִים) fat and large bulls, as it is stated (Ps. 22:13): “Fat bulls (אַבִּירֵי) of Bashan surrounded me.””
“With them, with the lambs and goats; by the unicorns and bullocks the kings of Edom are meant.”
“And as to the great, setting out their killing: and the unicorns, a fierce animal the size of a cat, with one horn, and thus it signifies the powerful and monarchs, shall go down, into death, above: their strong ones, and their high and glorious ones shall go down into it (Isa 5:14); and the magnitude of the killing, their land shall be soaked with blood: the land was killed with blood (Ps 105[106]:38).”
The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.