Contradiction with Proverbs 27:1
Contradicts by advising not to boast about tomorrow, whereas 1 Corinthians 16:6 expresses plans for the future.
Proverbs 27:1: Boast not thyself of to morrow; for thou knowest not what a day may bring forth. [to...: Heb. to morrow day]
Contradiction with James 4:13-14
Contradicts by warning against making future plans without acknowledging the uncertainty of life, whereas 1 Corinthians 16:6 discusses intended plans.
James 4:13-14: Go to now, ye that say, To day or to morrow we will go into such a city, and continue there a year, and buy and sell, and get gain: