C. F. Keil and Franz Delitzsch on Joshua 14:12

“The mountain,” according to the context, is the mountainous region of Hebron, where the spies had seen the Anakites (Num 13:22, Num 13:28). The two clauses, in Jos 14:12, beginning with כּי are not to be construed as subordinate to one another, but are co-ordinate clauses, and contain two distinct motives in support of his petition: viz., “for thou heardest in that day,” sc., what Jehovah said to me then, and also “for (because) the Anakites are there;” ... ”perhaps Jehovah is with me (אתי for אתּי, see Ges. §103, 1, anm. 1, and Ewald, §264, b.), and I root them out” (vid., Jos 15:14). The word “perhaps” does not express a doubt, but a hope or desire, or else, as Masius says, “hope mixed with difficulty; and whilst the difficulty detracts from the value, the hope stimulates the desire for the gift.”