Contradiction with Exodus 20:5
This verse mentions God being a jealous God, punishing children for the sin of the parents, whereas 1 John 4:9 emphasizes God's love.
Exodus 20:5: Thou shalt not bow down thyself to them, nor serve them: for I the LORD thy God [am] a jealous God, visiting the iniquity of the fathers upon the children unto the third and fourth [generation] of them that hate me;
Contradiction with Isaiah 45:7
This verse describes God as creating evil and causing calamity, while 1 John 4:9 focuses on God's love through Jesus.
Isaiah 45:7: I form the light, and create darkness: I make peace, and create evil: I the LORD do all these [things].
Contradiction with Romans 9:13
This verse speaks about God loving Jacob but hating Esau, contrasting with 1 John 4:9's message of love shown to all through Jesus.
Romans 9:13: As it is written, Jacob have I loved, but Esau have I hated.
Contradiction with 2 Thessalonians 1:9
This verse describes eternal destruction away from God's presence for some, while 1 John 4:9 emphasizes God's love and life through Jesus.
2 Thessalonians 1:9: Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power;
Paradox #1
1 John 4:9 focuses on God's love shown through sending his son. A potential contradiction might arise when compared to the notion of a loving God allowing suffering or requiring a sacrifice for forgiveness, which could seem inconsistent with the idea of unconditional love.