Luke 10:42

But only one thing is [really] needful. For Mary has made the better choice, which will not be taken away from her."

Hebrews 6:17

Since God wanted to show conclusively to those who would inherit the promise [i.e., Abraham and all of his spiritual descendants], how unchangeable His purpose was, He confirmed it with an oath.

Treasury of Scripture Knowledge

Summary

For thus saith the LORD unto the eunuchs that keep my sabbaths, and choose the things that please me, and take hold of my covenant;

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Bible References

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Luke 10:42
But only one thing is [really] needful. For Mary has made the better choice, which will not be taken away from her."

Take hold

Hebrews 6:17
Since God wanted to show conclusively to those who would inherit the promise [i.e., Abraham and all of his spiritual descendants], how unchangeable His purpose was, He confirmed it with an oath.