The mystery of holy unction (or Anointing of the Sick) provides both physical and spiritual healing with holy oil blessed by the Holy Spirit. In Greek, the mystery is called Εὐχέλαιον (Euchelaion, from εὐχή, ‘prayer’, and ἔλαιον, ‘oil’) and in Russian соборование (soborovanie), because it is traditionally celebrated by a sobor (assembly) of priests. (OrthodoxWiki)