Ps 49:10

“"For mine are all the beasts of the wood" [Psalm 50:10]. Why should I ask of you what I have made? Is it more yours, to whom I have given it to possess, than Mine, who have made it? "For mine are all the beasts of the wood." But perchance that Israel says, The beasts are God's, those wild beasts which I enclose not in my pen, which I bind not to my stall; but this ox and sheep and he-goat— these are my own. "Cattle on the mountain, and oxen." Mine are those which you possess not, Mine are these which you possess. For if you are My servant, the whole of your property is Mine. For it cannot be, that is the property of the master which the servant has gotten to himself, and yet that not be the property of the Master which the Master Himself has created for the servant. Therefore Mine are the beasts of the wood which you have not taken; Mine are also the cattle on the mountains which are yours, and the oxen which are at your stall: all are My own, for I have created them.”

“the behemoth of the thousand mountains That is (the bull) destined for the future feast [of the righteous], which grazes on a thousand mountains daily, and every day they grow back. Others explain this to mean one thousand mountains or one thousand parasangs (i.e., one mountain that is 1,000 parasangs long, or perhaps it should read: 1,000 bulls. The plural “mountains” indicates that there were many mountains of that type.[Shem Ephraim]) Others explain that this is like (Deut. 7:13): “the litter of your cattle (אלפיך).” i.e., mountains full of cattle, because he says, “I will not take from your household a bull.””

“"For all the beasts of the forests are mine." He proves what he said, namely that he approves neither calves nor goats, and that if he were in need, he would not accept them from their house. No one asks for something that is in his own power; but all things that they offered were in the power of God. Three things were offered in the Old Covenant: four-footed animals, birds, and fruits, namely first-fruits and bread. With respect to the first he says, "All the beasts of the forests are mine." Four-footed animals are divided into two kinds: some are wild and some domestic. And although wild animals were not offered, yet he enumerates them to make it more apparent that even the domestic ones are his. Mystically, moreover, various kinds of persons can be designated by these animals. Hence he says, "wild beasts," that is, unbelievers; "beasts of burden," that is, the faithful; "oxen on the mountains," that is, the apostles -- all are mine.”

“Oxen. St. Jerome and Protestants, “the cattle upon a thousand hills.” But our version is very good, and adopted by the Syriac, Ferrand, &c. (Calmet) — Aleph means an ox as well as a thousand; and i may have been added to the preceding word, instead of u, at the beginning of this. (Berthier) — We find u here improperly in either, “beast.” (Houbigant) — No mention is made of fishes, because they were not used as victims. (Calmet)”