James 2:14-25,
'14 What good is it, my brothers, if someone says he has faith but does not have works? Can that faith save him? 15 If a brother or sister is poorly clothed and lacking in daily food, 16 and one of you says to them, “Go in peace, be warmed and filled,” without giving them the things needed for the body, what good[a] is that? 17 So also faith by itself, if it does not have works, is dead.
18 But someone will say, “You have faith and I have works.” Show me your faith apart from your works, and I will show you my faith by my works. 19 You believe that God is one; you do well. Even the demons believe—and shudder! 20 Do you want to be shown, you foolish person, that faith apart from works is useless? 21 Was not Abraham our father justified by works when he offered up his son Isaac on the altar? 22 You see that faith was active along with his works, and faith was completed by his works; 23 and the Scripture was fulfilled that says, “Abraham believed God, and it was counted to him as righteousness”—and he was called a friend of God. 24 You see that a person is justified by works and not by faith alone. 25 And in the same way was not also Rahab the prostitute justified by works when she received the messengers and sent them out by another way?'
While not placing primary emphasis on works, it seems to me as if James is citing the importance of both faith and works in tandem.
Let us consider Judas Iscariot, a man who walked with Jesus, prayed with Jesus, fellowshipped with His people, presumably teaching and healing, performing miracles in the name of Jesus Christ.
Matthew 10:1
'Jesus called together his twelve disciples. He gave them the power to force out evil spirits and to heal every kind of disease and sickness...'
Was Judas Iscariot covered in salvation? After he betrayed Jesus and took his own life, was he still covered in salvation?