Deuteronomy 22:10 (NIV)
10Do not plow with an ox and a donkey yoked together.
2 Corinthians 6:14 (NIV)
14Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness?
Matthew 11:29 (NIV)
29Take my yoke upon you and learn from me, for I am gentle and humble in heart, and you will find rest for your souls.