“For every one shall be salted with fire, and every sacrifice shall be salted with salt.”
King James Version (KJV)
9:49 Every one - Who does not cut off the offending member, and consequently is cast into hell, shall be, as it were, salted with fire, preserved, not consumed thereby whereas every acceptable sacrifice shall be salted with another kind of salt, even that of Divine grace, which purifies the soul, (though frequently with pain) and preserves it from corruption.
Mr 9:49 For. Our Lord is alluding to the pervading idea of Mr 9:45-48. These sacrifices of hand, foot, eye, must be made; "for"-- every one shall be salted with fire. Fire is used in the Scripture to denote suffering, persecution, trial, distress of any kind. Salt is used to denote permanence, preservation from corruption. "Every one", good and bad, "must suffer".