وَحَدَّثَنِي مَالِكٌ، أَنَّهُ بَلَغَهُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ، أَتَتْهُ وَلِيدَةٌ قَدْ ضَرَبَهَا سَيِّدُهَا بِنَارٍ أَوْ أَصَابَهَا بِهَا فَأَعْتَقَهَا ‏.‏ قَالَ مَالِكٌ الأَمْرُ الْمُجْتَمَعُ عَلَيْهِ عِنْدَنَا أَنَّهُ لاَ تَجُوزُ عَتَاقَةُ رَجُلٍ وَعَلَيْهِ دَيْنٌ يُحِيطُ بِمَالِهِ وَأَنَّهُ لاَ تَجُوزُ عَتَاقَةُ الْغُلاَمِ حَتَّى يَحْتَلِمَ أَوْ يَبْلُغَ مَبْلَغَ الْمُحْتَلِمِ وَأَنَّهُ لاَ تَجُوزُ عَتَاقَةُ الْمُوَلَّى عَلَيْهِ فِي مَالِهِ وَإِنْ بَلَغَ الْحُلُمَ حَتَّى يَلِيَ مَالَهُ ‏.‏

Malik related to me that he had heard that a slave-girl came toUmar ibn al-Khattab (who had been beaten by her master with a red hotiron) and he set her free. Malik said, "The generally agreed-on way of doing things among us is that a man is not permitted to befreed while he has a debt against him which exceeds his property. Aboy is not allowed to be set free until he has reached puberty. Theyoung person whose affairs are managed cannot set free in hisproperty, even when he reaches puberty, until he manages hisproperty." Translation Not Available

Book reference: Muwatta Imam Malik Book 38 Hadith 1472
Web reference: Muwatta Imam Malik Book 38 Hadith 7