Deuteronomy 22:10

Thou shall not plow with an ox and a donkey together.

2 Corinthians 6:14-16

Do not become unequally yoked with unbelievers, for what partnership has righteousness and lawlessness? And what fellowship has light with darkness?

Treasury of Scripture Knowledge

Summary

Thou shalt not plow with an ox and an ass together.

Two different species cannot associate comfortably together, nor pull pleasantly either in cart or plough; and the ass being lower than the ox, when yoked, he must bear the principal part of the weight

Bible References

Two different species cannot associate comfortably together, nor pull pleasantly either in cart or plough; and the ass being lower than the ox, when yoked, he must bear the principal part of the weight

2 Corinthians 6:14
Do not become unequally yoked with unbelievers, for what partnership has righteousness and lawlessness? And what fellowship has light with darkness?