Mark 1:42
And as soon as he had spoken, immediately the leprosy departed from him, and he was cleansed.
Cross-references
Mark 1:31
Parallel
Mark 1:31 records the fever leaving immediately — same instantaneous healing as here.
Mark 5:29
Parallel
Mark 5:29 describes immediate healing of the bleeding woman — both show instant cleansing from impurity.
Psalm 33:9
Allusion
Psalm 33:9 says God spoke and it was — here Jesus' word cleanses leprosy instantly, showing divine authority.