Contradiction with Matthew 7:21-23
These verses suggest that not all who call on Jesus will enter the kingdom of heaven, contradicting the assurance in John 10:27 that His sheep follow Him and know His voice.
Matthew 7:21-23: Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Contradiction with Hebrews 6:4-6
This passage suggests that it is possible for believers to fall away, contradicting the implication in John 10:27 that those who know Jesus will consistently follow Him.
Hebrews 6:4-6: For [it is] impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
Contradiction with 2 Peter 2:20-22
These verses indicate that those who have known the way of righteousness can turn away again, conflicting with John 10:27's suggestion that His sheep hear His voice and follow Him consistently.
2 Peter 2:20-22: For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.
Contradiction with Matthew 13:20-21
This parable implies that some believers receive the word with joy but fall away due to tribulations, contradicting the promise in John 10:27 that His followers continuously follow His voice.
Matthew 13:20-21: But he that received the seed into stony places, the same is he that heareth the word, and anon with joy receiveth it;
Contradiction with Galatians 5:4
This verse warns against falling away from grace, contradicting the assurance in John 10:27 that His sheep follow and know Him permanently.
Galatians 5:4: Christ is become of no effect unto you, whosoever of you are justified by the law; ye are fallen from grace.