וַיַּ֥עַשׂ אֶת־הַיָּ֖ם מוּצָ֑ק עֶ֣שֶׂר בָּ֠אַמָּה מִשְּׂפָת֨וֹ עַד־שְׂפָת֜וֹ עָגֹ֣ל ׀ סָבִ֗יב וְחָמֵ֤שׁ בָּֽאַמָּה֙ קוֹמָת֔וֹ וקוה [וְקָו֙] שְׁלֹשִׁ֣ים בָּֽאַמָּ֔ה יָסֹ֥ב אֹת֖וֹ סָבִֽיב׃
I uczynił wodozbiór odlewany - dziesięć łokci od brzegu jednego do drugiego - zaokrąglony; wokoło na pięć łokci była wysokość jego, gdy sznur na trzydzieści łokci długi obejmował go dokoła.
Akeidat Yitzchak
In section 12, the Midrash states that Moses was afraid at the time that the holy spirit would depart from him and be transferred to the princes. G'd said to Moses "take it from them," i.e. accept it from them (Numbers 7,5) G'd said to Moses: "If I had told them to bring it, I would have told you to tell them. But, since the idea originated with them, I am telling you to accept these offerings, since the princes divined My will." Our rabbis wish to teach us from all this that it behooves us to try and emulate the princes. This is also what prompts Rashi in the name of Rabbi Moshe Hadarshan to explain the significance of each part of these offerings.