Who can count the dust of Jacob? - an Oriental hyperbole for a very populous nation, as Jacob’s posterity was promised to be (Gen 13:16; Gen 28:14).
the number of the fourth part of Israel - that is, the camp consisted of four divisions; every one of these parts was formidable in numbers.
Let me die the death of the righteous - Hebrew, “of Jeshurun”; or, the Israelites. The meaning is: they are a people happy, above all others, not only in life, but at death, from their knowledge of the true God, and their hope through His grace. Balaam is a representative of a large class in the world, who express a wish for the blessedness which Christ has promised to His people but are averse to imitate the mind that was in Him.