«لِفُلَانٍ عَلَيَّ قَفِيزُ حِنْطَةٍ»
“I owe so-and-so one qafiz of wheat.”
A qafiz is a measure of quantity. The statement already communicates an obligation, but some possible interpretations of the specified grain or its measure may remain. When the speaker fixes the recognized meaning already apparent from the wording, the additional speech is confirmation.
The speaker neither retracts the debt nor invents a new category of liability. The further words identify what was already meant within the original admission. The precise practical measure of a qafiz may depend on the applicable local convention.