Matthew Poole and continuators on Galatians 3:9

9 So then they which be of faith , are blessed with faithful Abraham .

Those that believe in Jesus Christ with such a Faith as the Gospel doth require, they, and they alone,

are blessed with spiritual blessings, justified from the guilt of sin; with Abraham, that is, in the same manner, that Abraham, the Father of the faithful, and who himself was a believer, was justified; which was not, (as was before said,) by his circumcision, or by any works that he did, but by imputation upon his believing in the Lord Jesus Christ, exhibited, and held forth in the promise made to him.