James 5:12 in the King James Version
But above all things, my brethren, swear not, neither by heaven, neither by the earth, neither by any other oath: but let your yea be yea; and your nay, nay; lest ye fall into condemnation.
Context
11 Behold, we call them blessed who endured. You have heard of the perseverance of Job and have seen the Lord in the outcome, and how the Lord is full of compassion and mercy.
12 But above all things, my brothers, don’t swear—not by heaven, or by the earth, or by any other oath; but let your “yes” be “yes”, and your “no”, “no”, so that you don’t fall into hypocrisy.
13 Is any among you suffering? Let him pray. Is any cheerful? Let him sing praises.