What is the legal status of a slave if the master said: 'If you read *a* Quran (an indefinite reading), you are free after my death', and the slave reads only part of it?

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If the master states, 'If you read a Quran (indefinite article), you are free after my death,' and the slave reads only part of the Quran, the slave becomes a Muddabbar. This is because the indefinite nature of the reading ('Qur'anan') implies partial completion, unlike the definite form.