Is anyone among you sick? Let him call for the elders of the church, and let them pray over him, anointing him with oil in the name of the Lord. 15 And the prayer of faith will save the sick, and the Lord will raise him up. And if he has committed sins, he will be forgiven. James 5:14
The first requirement for divine healing is a right relationship with the Lord. Hindrances, such as sin, will always stop the power of God from working in your life, see Matthew 6:14,15. The next requirement is faith. Without divine faith you receive nothing from the Lord, see Hebrews 11:6. Why does James tell you to call for the elders of the Church? Having a spirit of unity with united prayer, will overcome any satanic opposition to your healing. Being anointed with oil, and expecting God to heal you are very important. Even in your everyday world, the Lord is expecting you to pray for a person with a need who comes to you.