{Nay, we establish the law} (alla nomon histanomen).
Present indicative active of late verb histan(935c) from hist(886d)i.
This Paul hinted at in verse  21 . How he will show in chapter 4
how Abraham himself is an example of faith and in his life
illustrates the very point just made. Besides, apart from Christ
and the help of the Holy Spirit no one can keep God's law. The
Mosaic law is only workable by faith in Christ.