‘ “How God anointed Jesus of Nazareth with the Holy Ghost and with power who went about doing good and healing all that were oppressed of the devil, for God was with him.” Acts 10:38. “And ought not this woman, being a daughter of Abraham, whom Satan hath bound, lo, these eighteen years, be loosed from this bond on the Sabbath day?” Luke 13:16. This lordship of Satan in the realm of sickness can be traced back to the fall of man in the Garden of Eden. God said, “For in the day that thou eatest thereof thou shalt surely die (dying, thou shalt die).” Gen 2:17. Adam ate and the death process began. Sickness is the precursor of death. “Death passed upon all men, for that all have sinned.” Rom. 5:12. If death reigns over all men, then all men are subject to sickness, its subsidiary. Sickness and death came unto the world as a result of man’s fall in the garden of Eden (…)’
Source: Ralph M. Riggs, The Spirit Himself (1949), Chapter 18: The Gifts of Healings, p. 140 (added link to the text).
Note: Romans 5 does not teach that man inherited spiritual death (the death of his soul). Click here for more information.
Note 2: Genesis 3 teaches why physical death would come upon all descendants of Adam. Click here for more information.