Whose heart stirred him up, i.e. whose heart being desirous and ready to serve God, engaged his hand to offer what he had to his service.
Related Commentaries of Exodus 35:21
Exodus 35:21
21 And they came, every one whose heart stirred him up, and every one whom his spirit made willing, and they brought the LORD'S offering to the work of the tabernacle of the congregation, and for all his service, and for the holy garments.