Contradiction with Exodus 23:5
This verse suggests helping an enemy, whereas 2 Kings 5:8 implies focusing help on a foreign commander for God's glory.
Exodus 23:5: If thou see the ass of him that hateth thee lying under his burden, and wouldest forbear to help him, thou shalt surely help with him. [and...: or, wilt thou cease to help him? or, and wouldest cease to leave thy business for him: thou shalt surely leave it to join with him]
Contradiction with 2 Chronicles 19:2
Jehoshaphat is reprimanded for helping those who hate the Lord, contrasting with Elisha's willingness in 2 Kings 5:8.
2 Chronicles 19:2: And Jehu the son of Hanani the seer went out to meet him, and said to king Jehoshaphat, Shouldest thou help the ungodly, and love them that hate the LORD? therefore [is] wrath upon thee from before the LORD.
Contradiction with Matthew 5:44
Advises love and prayer for enemies, while 2 Kings 5:8 focuses on a specific miraculous intervention, not general love.
Matthew 5:44: But I say unto you, Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you;
Contradiction with Acts 10:34
Peter states God shows no favoritism, which contrasts with the targeted assistance to Naaman in 2 Kings 5:8.
Acts 10:34: Then Peter opened [his] mouth, and said, Of a truth I perceive that God is no respecter of persons: