The ruling when a master instructs forgiveness of an unspecified amount using relative terms.
General Chapter
Al-Mughni
Book of Mukātaba (Contractual Manumission)
Primary text
If the master says, 'Forgive him what is light,' or 'what is heavy,' or 'what is abundant,' this is left to the estimation of the heirs, because everything is light relative to what is lighter than it. This principle is applied when the master wills a great, abundant, heavy, or light sum of money.