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James 5:12
12 But [de] above [pro] all things [pas], my [mou] brethren [adelphos], swear [omnuo] not [me], neither [mete] by heaven [ouranos], neither [mete] by the earth [ge], neither [mete] by any [tis] other [allos] oath [horkos]: but [de] let [eto] your [humon] yea [nai] be [eto] yea [nai]; and [kai] your nay [ou], nay [ou]; lest [hina me] ye fall [pipto] into [eis] condemnation [hupokrisis]. KJV-Interlinear
12 But above all, my brethren, do not swear, either by heaven or by earth or with any other oath; but let your yes be yes, and your no, no; so that you may not fall under judgment. NASB
Above all, be honest in your life. Have integrity in your words and actions. Be honorable in your lifestyle.
Those who boast, those who brag, those who are adamant, those who are belligerent, those who are complainers, those who are quarrelsome, those who are defiant, those who have unreasonable expectations, those who elevate their own self importance, those who condescend, those who patronize, those who do all of these things and more, even naming God or heaven, the world or themselves as their authorizing agent, all of these are subscribers of evil, and therefore do not reside in fellowship.
They are subscribers of corruption and are the recipients of Gods wrath. And note, that Gods wrath does not come quickly or immediately. So they can easily come under the illusion of their own righteousness, as God allows them to go down the wrong path of life to their own ultimate destruction.
No one has any excuse, and everyone has sufficient information to make correct decisions and know the difference between Gods path and the worlds. God will never force anyone to follow His path. Every person has the freedom to choose on their own, even if their choice is self-destruction and failure.
Let your yes be yes and your no be no, simply means to be honest. Do not deceive. Do not cheat on contracts. Do not take advantage. Do not be an opportunist. Do not lie or make false accusations. Do not make mountains out of molehills.
In fact, you should go out of your way to protect others from your own faults, motives, desires, or weaknesses.
God is the ultimate and only provider, of all that you have or will ever have. So, you should never need to take either by force or deception, from anyone.
Grow up and be mature.