2 Corinthians 8:2-5

for during an ordeal of severe distress, their abundant joy and their deep poverty [together] overflowed in the wealth of their lavish generosity. For I testify that according to their ability, and beyond their ability, they gave voluntarily, begging us insistently for the privilege of participating in the service for [the support of] the saints [in Jerusalem]. Not only [did they give materially] as we had hoped, but first they gave themselves to the Lord and to us [as His representatives] by the will of God [disregarding their personal interests and giving as much as they possibly could].