2 Corinthians 8:3

8:3 For I testify, they gave according to their means and beyond their means. They did so voluntarily,

Galatians 4:15

4:15 Where then is your sense of happiness now? For I testify about you that if it were possible, you would have pulled out your eyes and given them to me!

Colossians 4:13

4:13 For I can testify that he has worked hard for you and for those in Laodicea and Hierapolis.