Are you saying that All sick Christians have a promise that they will be healed or that some Christians have a promise they will be healed?
Because the many Christians I know who have long term illness do not have any awarness of a promise that they will be healed.
For many of them they face a real problem, in that they risk death if they stop taking their meication but they also risk death if the continue to take their medication and are healed.
I am not advocating ,anyone to stop their medical treatment.
There is a real God who answers real prayer.
My hope is more people would trust Him with their health.
You will receive the measure of who you put your Faith in.
And yes all Christian's have the Promise of being healed ,just as all sinners at some point have the opportunity for salvation.
Isaiah 53: 5. But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.
1 Peter 2: 24. Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed.
Matthew 8: 14. And when Jesus was come into Peter's house, he saw his wife's mother laid, and sick of a fever. 15. And he touched her hand, and the fever left her: and she arose, and ministered unto them. 16. When the even was come, they brought unto him many that were possessed with devils: and he cast out the spirits with his word, and healed all that were sick: 17. That it might be fulfilled which was spoken by Esaias the prophet, saying, Himself took our infirmities, and bare our sicknesses.
John 15: 7. If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you. 8. Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples. 9. As the Father hath loved me, so have I loved you: continue ye in my love.
Matthew 7: 7. Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you: 8. For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. 9. Or what man is there of you, whom if his son ask bread, will he give him a stone? 10. Or if he ask a fish, will he give him a serpent? 11. If ye then, being evil, know how to give good gifts unto your children, how much more shall your Father which is in heaven give good things to them that ask him?
Acts 3: 18. But those things, which God before had shewed by the mouth of all his prophets, that Christ should suffer, he hath so fulfilled.
Galatians 4: 4. But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, 5. To redeem them that were under the law, that we might receive the adoption of sons. 6. And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying, Abba, Father. 7. Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.
Mark 11: 22. And Jesus answering saith unto them, Have faith in God. 23. For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith. 24. Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them. 25. And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses. 26. But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.