Deuteronomy 22:9

Thou shalt not sow thy vineyard with divers seeds: lest the fruit of thy seed which thou hast sown, and the fruit of thy vineyard, be defiled.

Cross-reference

Leviticus 19:19 gives the same prohibition against mixing seeds — a parallel law within the Torah.

James 1:6-8 condemns double-mindedness — a clear parallel to the principle against mixing seeds: both warn against mixing incompatible things.

In 2 Corinthians 6:14, Paul applies the same separation principle—do not mix—to believers and unbelievers, echoing the OT command about mixed seeds.

Matthew 6:24 teaches you cannot serve two masters — reflecting the same principle of avoiding mixture found in the seed law.

Matthew 9:16 warns against mixing old and new cloth — a similar principle of not combining unlike things.

2 Corinthians 11:3 warns against being led astray from pure devotion — a parallel to the principle of not mixing (as in seeds).

James 3:10 Parallel

James 3:10 says praise and cursing should not come from the same mouth — a parallel to the prohibition of mixing seeds.