For the promise...

Romans 4:13-16

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¹³ For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith. ¹⁴ For if they which are of the law be heirs, faith is made void, and the promise made of none effect: ¹⁵ Because the law worketh wrath: for where no law is, there is no transgression. ¹⁶ Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

Faith works righteousness, not strict adherence to law. Faith is yoked with grace. 'of faith...by grace'

Abraham is the father of us all.