The association between demons and sickness is shown by the following: "They brought unto him(Jesus) many that were possessed with demons: and He cast out the spirits with His word...that it might be fulfilled which was spoken by Isaiah the prophet (in the Old Testament), saying, Himself took our infirmities, and bare our sicknesses" (Matthew 8:16,17).
Muunganiko kati ya pepo na ugonjwa umeonyeshwa kama ifuatavyo:"Wakamletea (Yesu) wengi wenye pepo: akawatoa pepo kwa neno lake …… ili litimie lile neno lililonenwa na nabii Isaya (Katika Agano la Kale) akisema, mwenyewe aliutwaa udhaifu wetu, na kuchukua magonjwa yetu"(Math. 8: 16, 17).