פּירוש אויף דברים 33:19

עמים THE PEOPLES of the tribes of Israel,

ושפני טמוני חול, “and the hidden treasures of the sand.” Sometimes when ships break up when at harbour and are buried deep in the sand; when the waters of the sea retreat, it is revealed that this sand which buried their ships had also hidden treasures which would have remained undiscovered if the ship had not broken up.

עמים הר יקראו, “being aware of the dangers of seafaring they would make frequent trips to Mount Zion to thank G–d for their success and ask Him for continued protection. Once they were there, they would present many voluntary offerings in the Temple. (Compare Talmud tractate Chulin, folio 13, based on Leviticus 22,18)

הר יקראו THEY CALL TO THE MOUNTAIN, i.e., they assembled at Mount Moriah on the Festivals; — it speaks of calling them there because every assembly was (took place) in general by means of a summons to it — and שם THERE יזבחו THEY SACRIFICED on the Festivals, זבחי צדק SACRIFICES OF RIGHTEOUSNESS.