Midrash for Numbers 26:25
אֵ֛לֶּה מִשְׁפְּחֹ֥ת יִשָּׂשכָ֖ר לִפְקֻדֵיהֶ֑ם אַרְבָּעָ֧ה וְשִׁשִּׁ֛ים אֶ֖לֶף וּשְׁלֹ֥שׁ מֵאֽוֹת׃ (ס)
These are the families of Issachar according to those that were numbered of them, threescore and four thousand and three hundred.
Sifrei Bamidbar
(Bamidbar 26:25) "Only by lot shall the land be divided": ("Only") — excluding Joshua and Calev (who received special portions.) And thus is it written (Judges 15:13) "And to Calev ben Yefuneh was given a portion in the midst of the children by word of the L-rd to Joshua," and (Judges 1:20) "And they gave Chevron to Calev as Moses had spoken," and (Joshua 19:49-50) "And the children of Israel gave a portion to Joshua the son of Nun in their midst. By word of the L-rd they gave him the city that he asked for, Timnath Serach."
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