Contradiction with Proverbs 11:24
This verse suggests that one can increase by giving freely, contradicting Paul's decision to forgo his rightful dues in 1 Corinthians 9:15.
Proverbs 11:24: There is that scattereth, and yet increaseth; and [there is] that withholdeth more than is meet, but [it tendeth] to poverty.
Contradiction with Matthew 10:10
Jesus instructs the disciples to rely on the support of those they minister to, contradicting Paul's refusal of support in 1 Corinthians 9:15.
Matthew 10:10: Nor scrip for [your] journey, neither two coats, neither shoes, nor yet staves: for the workman is worthy of his meat. [staves: Gr. a staff]
Contradiction with Galatians 6:6
Advises that those taught the word should share all good things with their instructor, contrasting Paul's choice not to benefit from his preaching.
Galatians 6:6: Let him that is taught in the word communicate unto him that teacheth in all good things.