Ibn Ezra on Numbers 32:9

ויעלו עד נחל אשכול. כי העולים מצפון הלכו לנגב: FOR WHEN THEY WENT UP UNTO THE VALLEY OF ESHCOL. For those who went up¹¹Scripture reads, and they went up. According to I.E. this implies going north. to the north, went to the south.¹²They went north from Kadesh-barnea, where they were camped, to the south of Israel. See I.E. on Num. 13:17. Note that we have rendered mi-tzafon to the north, for I.E. occasionally uses the mem to mean to. Vat. Ebr. 38 reads: They went from the south to the north.