Because God wanted to make the unchanging nature of his purpose very clear to the heirs of what was promised, he confirmed it with an oath.
NIV
Accordingly God also, in His desire to show more convincingly and beyond doubt to those who were to inherit the promise the unchangeableness of His purpose and plan, intervened (mediated) with an oath.
AMP
Wherein God, willing more abundantly to shew unto the heirs of promise the immutability of his counsel, confirmed it by an oath:
KJV
At that time his voice shook the earth, but now he has promised, "Once more I will shake not only the earth but also the heavens."
NIV
Then [at Mount Sinai] His voice shook the earth, but now He has given a promise: Yet once more I will shake and make tremble not only the earth but also the [starry] heavens. [Hag. 2:6.]AMP
Whose voice then shook the earth: but now he hath promised, saying, Yet once more I shake not the earth only, but also heaven.
KJV
He remembers his covenant forever, the promise he made, for a thousand generations,
NIV
He is [earnestly] mindful of His covenant and forever it is imprinted on His heart, the word which He commanded and established to a thousand generations,
AMP
He hath remembered his covenant for ever, the word which he commanded to a thousand generations.
KJV
By faith he made his home in the promised land like a stranger in a foreign country; he lived in tents, as did Isaac and Jacob, who were heirs with him of the same promise.
NIV
[Prompted] by faith he dwelt as a temporary resident in the land which was designated in the promise [of God, though he was like a stranger] in a strange country, living in tents with Isaac and Jacob, fellow heirs with him of the same promise. [Gen. 12:1-8.]AMP
By faith he sojourned in the land of promise, as in a strange country, dwelling in tabernacles with Isaac and Jacob, the heirs with him of the same promise:
KJV
You will be faithful to Jacob, and show love to Abraham, as you pledged on oath to our ancestors in days long ago.
NIV
You will show Your faithfulness and perform the sure promise to Jacob and loving-kindness and mercy to Abraham, as You have sworn to our fathers from the days of old. [Luke 1:54, 55.]AMP
Thou wilt perform the truth to Jacob, and the mercy to Abraham, which thou hast sworn unto our fathers from the days of old.
KJV
You have kept your promise to your servant David my father; with your mouth you have promised and with your hand you have fulfilled it – as it is today.
NIV
You Who have kept Your promises to my father David and fulfilled with Your hand what You spoke with Your mouth, as it is today.
AMP
Thou which hast kept with thy servant David my father that which thou hast promised him; and spakest with thy mouth, and hast fulfilled it with thine hand, as it is this day.
KJV
"The LORD has kept the promise he made: I have succeeded David my father and now I sit on the throne of Israel, just as the LORD promised, and I have built the temple for the Name of the LORD, the God of Israel."
NIV
And the Lord has fulfilled His promise which He made: I have risen up in the place of David my father, and sit on the throne of Israel, as the Lord promised, and have built a house for the Name (renown) of the Lord, the God of Israel.
AMP
And the LORD hath performed his word that he spake, and I am risen up in the room of David my father, and sit on the throne of Israel, as the LORD promised, and have built an house for the name of the LORD God of Israel.
KJV
Nor because they are his descendants are they all Abraham's children. On the contrary, "It is through Isaac that your offspring will be reckoned."
NIV
And they are not all the children of Abraham because they are by blood his descendants. No, [the promise was] Your descendants will be called and counted through the line of Isaac [though Abraham had an older son]. [Gen. 21:9-12.]AMP
Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called.
KJV
In other words, it is not the natural children who are God's children, but it is the children of the promise who are regarded as Abraham's offspring.
NIV
That is to say, it is not the children of the body [of Abraham] who are made God's children, but it is the offspring to whom the promise applies that shall be counted [as Abraham's true] descendants.
AMP
That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.
KJV
