Deuteronomy 22:10

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

2 Corinthians 6:14-16

Set yourselves therefore at large, and bear not a stranger's yoke with the unbelievers. For what fellowship hath righteousness with unrighteousness? What company hath 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
Set yourselves therefore at large, and bear not a stranger's yoke with the unbelievers. For what fellowship hath righteousness with unrighteousness? What company hath light with darkness?