Numbers 23:10

מי מנה עפר יעקב וגו׳ WHO HATH COUNTED THE DUST OF JACOB [AND THE NUMBER OF THE FOURTH PART OF ISRAEL] — Understand this as the Targum does: [who has counted] the infants of the house of Jacob, who are compared to the dust of the earth (Genesis 13:16). The words מארבע משריתא in the Targum mean; [who can count … even one] of the four (רבע “a fourth”) banners (companies of the tribes). — Another explanation of עפר יעקב is: Countless are the commandments which they practise in connection with dust: (Deuteronomy 22:10) “Thou shalt not plough with an ox and an ass [together]”; (Leviticus 19:19): “Thou shalt not sow thy field with two kinds of seeds”. There are also the ashes of the red cow (Numbers 19:9 ff.), and the dust used in the ordeal to which a woman suspected of infidelity is subjected (Numbers 5:17), and others similar to these (Midrash Tanchuma, Balak 12). ומספר את רבע ישראל The word רבע implies their matings — the offspring which issues from their relations (cf. Nedarim 31a; and Rashi on Numbers 24:3). תמת נפשי מות ישרים LET ME DIE THE DEATH OF THE UPRIGHT amongst them.

מִ֤י מָנָה֙ עֲפַ֣ר יַעֲקֹ֔ב וּמִסְפָּ֖ר אֶת־רֹ֣בַע יִשְׂרָאֵ֑ל תָּמֹ֤ת נַפְשִׁי֙ מ֣וֹת יְשָׁרִ֔ים וּתְהִ֥י אַחֲרִיתִ֖י כָּמֹֽהוּ׃

Who can count the dust of Ya῾aqov, and the number of the fourth part of Yisra᾽el? Let me die the death of the righteous, and let my last end be like his!