EXOD1066 If someone performs an unnecessary service for us, we should be considerate of his feelings. The people were asked to contribute to material necessary for building the Sanctuary. With great enthusiasm, they responded with the various items that were needed. When the men in charge of the collection reported to Moshe that they were receiving an abundance of material, Moshe commanded the people to suspend further work on their offerings. Sforno notes that Moshe did not instruct that the people should not bring any more items, but that they should discontinue doing additional work. Some of the people had already completed doing work for the Sanctuary and had they been told not to bring with they had already prepared, they would have been most disappointed. Moshe, therefore, worded his announcement in a manner that would not cost them anguish. (Shaar bas Rabim, on this verse). If someone does something for you which ultimately proves to have been superfluous, be considerate of his feelings. Do not tell him that his efforts were not actually needed, since this will cause him needless disappointment.