'Oath' in the Bible

So in my anger I swore a solemn oath that they would never enter my rest."

And to whom did he make an oath that they might not come into his rest? was it not to those who went against his orders?

We who have believed are entering that rest, just as he has said, "So in my anger I swore a solemn oath that they would never enter my rest,"

For when God made his promise to Abraham, he swore an oath by himself, since he had no one greater to swear by.

For men verily swear by the greater: and an oath for confirmation is to them an end of all strife.

Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:

so that by two unchangeable things [His promise and His oath] in which it is impossible for God to lie, we who have fled [to Him] for refuge would have strong encouragement and indwelling strength to hold tightly to the hope set before us.

And inasmuch as not without an oath he was made priest:

(For those priests were made without an oath; but this with an oath by him that said unto him, The Lord sware and will not repent, Thou art a priest for ever after the order of Melchisedec:)

For the law maketh men high priests which have infirmity; but the word of the oath, which was since the law, maketh the Son, who is consecrated for evermore.

Whose voice was the cause of the shaking of the earth; but now he has made an oath, saying, There will be still one more shaking, not only of the earth, but of heaven.