פירוש על דברים 34:8

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).

ויתמו ימי בכי אבל משה ויהושוע בן נון מלא רוח חכמה, for during the days of weeping for Moses there was neither wisdom nor counsel (חכמה ועצה).

ויבכו בני ישראל, The Jewish people wept, etc. When Aaron's death is reported in Numbers 20,29, the Torah wrote that "the whole house of Israel wept for thirty days." Our sages in Avot de Rabbi Natan 12 claim that Aaron's having been a lover of peace was the reason why he was mourned even more than Moses when he died.