Contradiction with John 14:19
1 Corinthians 9:1 states, "Have I not seen Jesus Christ our Lord?" while John 14:19 suggests that the world will not see Jesus anymore, which could contradict the claim of seeing Jesus.
John 14:19: Yet a little while, and the world seeth me no more; but ye see me: because I live, ye shall live also.
Contradiction with John 1:18
This verse states, "No man hath seen God at any time," which may contradict Paul’s assertion of having seen Jesus, considering theological interpretations of Jesus’ divinity.
John 1:18: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared [him].
Contradiction with 2 Corinthians 5:7
This verse says, "For we walk by faith, not by sight," which contradicts the emphasis on seeing Jesus as validation for apostleship in 1 Corinthians 9:1.
2 Corinthians 5:7: (For we walk by faith, not by sight:)