"'Take from yourselves an offering for the Lord; every generous hearted person shall bring it, [namely] the Lord's offering: gold, silver, and copper"
Rashi brings a question: what does Moshe mean by "every generous hearted person"? Can you only bring these materials if you belong in the 'category' of "generous hearted"?
Rashi brings an answer that the person who brings these materials is said to be a נְדִ֣יב לִבּ֔וֹ because it is his heart in the first place that brought him to be a generous person and bring the materials. what is another reason that a person who brings these materials is called a נְדִ֣יב לִבּ֔וֹ?