Or HaChaim on Exodus 38:24/אור החיים על שמות ל״ח:כ״ד

1 כל הזהב העשוי למלאכה, All the gold used in the construction, etc. The words ויהי זהב התנופה in this verse seem superfluous or at least not in their proper place. The words כל הזהב העשוי do not seem to fit at all. Perhaps the Torah wishes to underline that of all the gold handed over to the various artisans not an ounce remained unaccounted for; it was all used up in the construction of the vessels which were to be made of gold. The whole verse then is testimony to the integrity of the artisans employed in fashioning all the parts made of gold. The words בכל מלאכת הקודש mean that all the gold was used up in the construction of the sacred vessels.

2The Torah may also allude to miracles which occurred to the gold used for the vessels of the Tabernacle. We all know that when one constructs vessels out of any metal including gold, the fact that it has to be melted down, etc., results in some diminution of the original amount of metal one started with. The more the original lump of gold had to be divided in order to construct all the various smaller parts made of gold, the greater the percentage lost in the process. The Torah testifies here that there was absolutely no wastage; all the original material was used up fully to become part of the sacred work בכל מלאכת הקודש. The word העשוי may be translated as "fit to be used to make something of." If something that the Israelites contributed was fit to be used in the construction of the Tabernacle, it was fully made use of. The word בכל means that all of the original amount contributed was immediately put to use in the construction. If this had not been the case, the miracle that nothing was left over would not have been noticeable. One could have added materials from the pool of raw materials whenever one ran short of something. This was not the case, however. The miracle was noticeable only because there was neither excess nor shortage during any stage of the construction of the many items required for the project.