Imam Malik, may Allah have mercy on him, said that if a person has so much debt that all his wealth could go towards paying it off, then if he frees a slave man or woman, it is not valid. Similarly, it is not valid for a minor to free his slave man or woman until he reaches maturity, nor for his guardian as long as his guardianship remains.
A slave girl was brought to Sayyiduna Umar bin Khattab (may Allah be pleased with him) whose master had burned her with fire, so he (may Allah be pleased with him) set her free.
Hadith Referenceموطا امام مالك رواية يحييٰ / كتاب العتق والولاء / 1273
Hadith Gradingمحدثین:موقوف ضعيف
Hadith Takhrij«موقوف ضعيف، وأخرجه عبد الرزاق فى «مصنفه» برقم: 7928، فواد عبدالباقي نمبر: 38 - كِتَابُ الْعِتْقِ وَالْوَلَاءِ-ح: 7»