וַיִּבְכּוּ֩ בְנֵ֨י יִשְׂרָאֵ֧ל אֶת־מֹשֶׁ֛ה בְּעַֽרְבֹ֥ת מוֹאָ֖ב שְׁלֹשִׁ֣ים י֑וֹם וַֽיִּתְּמ֔וּ יְמֵ֥י בְכִ֖י אֵ֥בֶל מֹשֶֽׁה׃
Y lloraron los hijos de Israel á Moisés en los campos de Moab treinta días: Y así se cumplieron los días del lloro del luto de Moisés.
Rashi
בני ישראל THE CHILDREN OF ISRAEL [WEPT] — i.e., the men; but regarding Aaron, — because he pursued peace, and made peace between a man and his fellow, and between a woman and her husband, it is stated, (Numbers 20:29) “The whole house of Israel [wept for him]” — the men and the women (Pirkei DeRabbi Eliezer 17).
Chizkuni
ויבכו בני ישראל, “The Children of Israel wept, etc.” when Aaron had died the Torah describes “the whole house of Israel” as having mourned his passing. (Numbers 20,29) The reason for the difference was that at that time anyone seeing Moses cry at the death of his brother could not help crying also. When Moses died there was no one left of such a stature that it would cause him to cry also. [Alternately, the women did not weep at Moses’ passing.]
Ibn Ezra
the sons of Israel But when Aaron died, the whole “House of Israel” mourned [Numbers 20: 29], out of respect for Moshe.