Contradiction with Mark 16:17
This verse states that those who believe will speak in new tongues, implying that speaking in tongues is a universal sign for believers, which contrasts with 1 Corinthians 14:5 that suggests prophecy is greater than speaking in tongues unless interpreted.
Mark 16:17: And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues;
Contradiction with Acts 2:4
Here, all were filled with the Holy Spirit and began to speak in tongues as the Spirit enabled them, indicating the importance of speaking in tongues, seemingly contradicting the preference for prophecy in 1 Corinthians 14:5.
Acts 2:4: And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
Contradiction with 1 Corinthians 14:18-19
Paul states he would rather speak five words with understanding than ten thousand in a tongue, contrasting with the encouragement of speaking in tongues found in 1 Corinthians 14:5.
1 Corinthians 14:18-19: I thank my God, I speak with tongues more than ye all: