'Perform' in the Bible

Again, ye have heard that it hath been said by them of old time, Thou shalt not forswear thyself, but shalt perform unto the Lord thine oaths:

To perform the mercy promised to our fathers, and to remember his holy covenant;

And being fully persuaded that, what he had promised, he was able also to perform.

For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.

Now therefore perform the doing of it; that as there was a readiness to will, so there may be a performance also out of that which ye have.

Being confident of this very thing, that he which hath begun a good work in you will perform it until the day of Jesus Christ: