And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit?(James 2:16)

Even so faith, if it hath not works, is dead, being alone.(James 2:17)

Yea, a man may say, Thou hast faith, and I have works: shew me thy faith without thy works, and I will shew thee my faith by my works.(James 2:18)

Thou believest that there is one God; thou doest well: the devils also believe, and tremble.

But wilt thou know, O vain man, that faith without works is dead?(James 2:20)

Was not Abraham our father justified by works, when he had offered Isaac his son upon the altar?(James 2:21)

Seest thou how faith wrought with his works, and by works was faith made perfect?(James 2:22)

Other publications related to "James 2:19":

Romans 4 - How does faith work?
Exploring the importance of faith in salvation and how it works through examples from the Bible, particularly the stories of Mary, Joseph, Zacharias, and Abraham. Emphasizing the need for patience and persistence in Gods timing and the power of opposition to strengthen ones faith. Encouraging listeners to cultivate their faith and pray for an increase in it, with the belief that God can perform miracles and bring blessings and revival.

Declare and believe are not the same
In this article, Dr. Roberto Miranda discusses the difference between declaring and believing, emphasizing the importance of true faith and the role it plays in allowing miracles to happen.

James 2:19 - Cross Reference

That they may know from the rising of the sun, and from the west, that there is none beside me. I am the LORD, and there is none else. (Isaiah 45:6)

And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord: (Mark 12:29)

For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ. (Jude 1:4)

But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him. (1 Corinthians 8:6)

And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye? (Acts 19:15)

Now a mediator is not a mediator of one, but God is one. (Galatians 3:20)

For there is one God, and one mediator between God and men, the man Christ Jesus; (1 Timothy 2:5)

Ye are my witnesses, saith the LORD, and my servant whom I have chosen: that ye may know and believe me, and understand that I am he: before me there was no God formed, neither shall there be after me. (Isaiah 43:10)

Saying, Let us alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us? I know thee who thou art, the Holy One of God. (Mark 1:24)

Remember the former things of old: for I am God, and there is none else; I am God, and there is none like me, (Isaiah 46:9)

The same followed Paul and us, and cried, saying, These men are the servants of the most high God, which shew unto us the way of salvation. (Acts 16:17)

And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? art thou come hither to torment us before the time? (Matthew 8:29)

One Lord, one faith, one baptism, (Ephesians 4:5)

And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. (Jude 1:6)

And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet are, and shall be tormented day and night for ever and ever. (Revelation 20:10)

Fear ye not, neither be afraid: have not I told thee from that time, and have declared it? ye are even my witnesses. Is there a God beside me? yea, there is no God; I know not any. (Isaiah 44:8)

And the LORD shall be king over all the earth: in that day shall there be one LORD, and his name one. (Zechariah 14:9)

As concerning therefore the eating of those things that are offered in sacrifice unto idols, we know that an idol is nothing in the world, and that there is none other God but one. (1 Corinthians 8:4)

And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent. (John 17:3)

Seeing it is one God, which shall justify the circumcision by faith, and uncircumcision through faith. (Romans 3:30)

And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years, (Revelation 20:2)

Saying, Let us alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us? I know thee who thou art; the Holy One of God. (Luke 4:34)

Thus saith the LORD the King of Israel, and his redeemer the LORD of hosts; I am the first, and I am the last; and beside me there is no God. (Isaiah 44:6)

Hear, O Israel: The LORD our God is one LORD: (Deuteronomy 6:4)

And cried with a loud voice, and said, What have I to do with thee, Jesus, thou Son of the most high God? I adjure thee by God, that thou torment me not. (Mark 5:7)

If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well: (James 2:8)