Bible Verses About All Christians Should Be As Missionaries: With a willing heart

Thus every man and woman of the people of Isra'el whose heart impelled him to contribute to any of the work ADONAI had ordered through Moshe brought it to ADONAI as a voluntary offering.

The people were filled with joy, because they had given willingly - wholeheartedly they had given willingly to ADONAI; and David the king too was completely filled with joy,

"But who am I, and what is my people, that we should be able to give so willingly in this way? For all things come from you, so that we have given you what is already yours.