Sforno on Exodus 25:2/ספורנו על שמות כ״ה:ב׳

1דבר אל בני ישראל ויקחו לי תרומה, tell the stewards of Israel that I desire that they should collect a contribution for Me. [the Torah had not specified “who” should take. Ed.] Moses also issued such instructions on his return from the mountain the third time as the Torah reports (Exodus 34,32) ואחרי כן נגשו כל בני ישראל, ויצום את כל אשר דבר ה' אתו בהר סיני, “after that all the people of Israel drew near, and he commanded them all that the Lord had talked about with him on Mount Sinai.” This was followed by ויאמר משה אל כל עדת בני ישראל קחו מאתכם תרומה in 35,4. The עדת בני ישראל who were to carry out this “taking (accepting) of the gifts were the Sanhedrin, the High Court. The Israelites were so anxious to contribute that they did not wait until the High Court organised all this, but they approached Moses personally bringing with them so many contributions that Moses was forced to call a halt to this (36,5). This was also the reason that there was nothing left for the princes of Israel (the tribal chiefs) to contribute other than the gemstones for Aaron’s breastplate and the various oils making up the “oil of anointing.”

2מאת כל איש, G’d commanded that the procedure should not be like the imposition of every man’s contribution for the public charity fund which was treated as a tax. Contributions were to be accepted only from volunteers.