Sforno on Deuteronomy 10:6/ספורנו על דברים י׳:ו׳

1ובני ישראל נסעו , even though they had seen that the prayer of a righteous person may prove a protection for the members of his generation so that it is most appropriate to mourn his death, in this instance we find that the Israelites in their search for water journeyed on without delay, not a word being said about their taking time out to mourn the passing of Aaron. This is the meaning of the construction: “there Aaron died, was buried…and Eleazar became High Priest in his stead.” They neither took time out to mourn Aaron nor did they celebrate the appointment of a new High Priest, a position which made that person the interlocutor on their behalf. Rather, משם נסעו הגדגודה, to graze their sheep;

2ומן הגדגודה יטבת, ארץ נחלי מים, for all the locations mentioned had water which was adequate for the needs of their livestock. Still, they paid no heed to the damage they had incurred by the death of a righteous man such as Aaron, neither to his honour, nor to the dishonour they had caused themselves by allowing the passing of a man of such caliber to go by unnoticed. [Numbers 20,28-29 reports Aaron’s death as well as the fact that the entire community of Israel bewailed his death for thirty days. Ed.]