'Fulfilling' in the Bible

Fire and hail, snow and vapour, stormy wind fulfilling his word;

And as John was fulfilling his course he said, Whom do ye suppose that I am? I am not he. But behold, there comes one after me, the sandal of whose feet I am not worthy to loose.

and uncircumcision by nature, fulfilling the law, judge thee, who, with letter and circumcision, art a law-transgressor?