Commentary for Joshua 17:14

And the descendants of Yoseif spoke. Referring specifically to the descendants of Menashe.⁶According to Rashi even though the tribe of Ephraim was part of the “descendants of Yoseif”, they did not join the tribe of Menashe in their complaint. The reason being, as Rashi later explains, was that while the tribe of Menashe had experienced a sharp increase of their population, the tribe of Ephraim experienced a decrease in its population, and were therefore quite satisfied with their portion of inheritance. This is based on the opinion that the size of the individual tribe’s inheritance was determined by their number at the time they left Egypt. During the years in the desert Menashe grew faster than any other tribe. When they left Egypt their number was 32,200 and when they entered Eretz Yisroel it was 52,700, an increase of 20,500. They were given land for 32,200 portions but they had to divide it among all 52,700 members of their tribe, and this was the basis of their complaint.

For until now so much has Adonoy blessed me. For you have seen that my population has increased from the first counting to the second counting by twenty thousand, five hundred, which is the numerical equivilent of כּה (25). In the first counting you found the number of Menashe, stated in Seifer Bamidbar,⁷Parshas Bamidbar 1:35. to be thirty two thousand, two hundred, and in Parshes Pinchos⁸ Bamidbar 26:34. their number was fifty two thousand, seven hundred. Another explanation is: until now, until כּה referring to the blessing that was said to Avrohom, “So (כּה) shall be your seed.”⁹Bereishis 15:5. This blessing has been fulfilled in my tribe. And according to its plain meaning, until now-as I am now— until I am the multitude you see now.