The phrase “One who walks” refers to one’s commitment on living his/her life according to God’s standard. The word “righteously” means to live or to make it your goal to imitate the life of Jesus Christ as told in the New Testament. Even what comes out of our mouths must be sprinkled with love and grace which is [kindness].
Shepherds can be attributed to any believer who are leading people to Jesus Christ for salvation. It has to be the Jesus of the Scriptures not the one that the false religions preach. To be after God’s heart is to know the truth and teach the people what the Bible says and means.