Rashi on Deuteronomy 33:19/רש"י על דברים ל״ג:י״ט

1עמים THE PEOPLES of the tribes of Israel,

2הר 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.

3כי שפע ימים יינקו FOR OF ABUNDANCE OF THE SEAS SHALL THEY — Issachar and Zebulun — SUCK, and they will consequently have leisure to busy themselves with the study of the Torah.

4ושפני טמוני חול means, covered things that are hidden in the sand — the Tarith (a kind of fish; Rashi in his comment on the Talmudical passage afterwards quoted states that it is the tuna fish), the Chalazon (from which purple dye was obtained) and while glass (all valuable articles of commerce) which come out of the sea and the sand. This was in the territory of Issachar and Zebulun, as it is stated in Treatise Megillah 6a: The Scriptural text (Judges 5:18) is to be explained as follows: “Zebulun was a people that cursed his soul even unto death” because that “Naphtali was on the high places of the field“, i.e., Zebulun complained about his territory, saying, To my brother (Naphtali) you have given fields and vineyards (while to me you have given hilly and mountainous land; to my brother you have given land while to me you have given seas and rivers! God replied. “All your brethren will be in need of you”, as it states, “And the treasures hidden in the sand”, which the Talmud goes on to explain are the marine creatures Rashi mentions above, deriving each of them from the words of the text, For they shall suck … of the concealed treasures of the sea).

5ושפני has the meaning of “covering”, as it is said (1 Kings 6:9) “And he covered (ויספן) the house”; (Jeremiah 22:14) וספן בארז, which the Targum renders by: “And it was covered with panels of cedar”. — Another explanation of עמים הר יקראו THEY CALL THE PEOPLES TO THE MOUNTAIN — Through Zebulun’s trading, merchants of the world’s nations will come to his land, he living at the coast, and they will say, “Since we have taken so much trouble to reach here, let us go to Jerusalem and see what is the God of this people and what are His doings”. When they behold all Israel serving one God and eating one kind of food (only that which is permissible to them), they are astonished because as regards the other nations, the god of one is not as the god of another, and the food of one is not as the food of another, so that they will say, “There is no nation as worthy as this”, and they will therefore become proselytes to Judaism there, as it is said, “There shall they sacrifice sacrifices of righteousness” (Sifrei Devarim 354:5).

6כי שפע ימים יינקו FOR OF THE ABUNDANCE OF THE SEAS SHALL THEY SUCK — “they” means Zebulun and Issachar; for the sea will give them wealth in abundance.