Sahih al-Bukhari, Volume 3, Book 46, Hadith 735 (USC-MSA) ⓘ

Narrated 'Aishah (ra) that Barira came to seek her help writing of emancipation and she had to pay five Uqiya (of gold) by five yearly installments. 'Aishah said to her, "Do you think that if I pay the whole sum at once, your masters will sell you to me, and I will free you and your Wala' will be for me." Barira went to her masters and told them about that offer. They said that they would not agree to it unless her Wala' would be for them. 'Aishah further said, "I went to Allah's Messenger and told him about it." Allah Messenger said to her, "Buy Barira and manumit her and the Wala' will be for the liberator." Allah's Messenger then got up and said, "What about those people who stipulate conditions that are not present in Allah's Laws? If anybody stipulates a condition which is not in Allah's Laws, then what he stipulates is invalid. Allah's Condition (Laws) are the truth and are more solid."

وَقَالَ اللَّيْثُ حَدَّثَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ عُرْوَةُ قَالَتْ عَائِشَةُ ـ رضى الله عنها ـ إِنَّ بَرِيرَةَ دَخَلَتْ عَلَيْهَا تَسْتَعِينُهَا فِي كِتَابَتِهَا وَعَلَيْهَا خَمْسَةُ أَوَاقٍ، نُجِّمَتْ عَلَيْهَا فِي خَمْسِ سِنِينَ، فَقَالَتْ لَهَا عَائِشَةُ وَنَفِسَتْ فِيهَا أَرَأَيْتِ إِنْ عَدَدْتُ لَهُمْ عَدَّةً وَاحِدَةً، أَيَبِيعُكِ أَهْلُكِ، فَأُعْتِقَكِ، فَيَكُونَ وَلاَؤُكِ لِي فَذَهَبَتْ بَرِيرَةُ إِلَى أَهْلِهَا، فَعَرَضَتْ ذَلِكَ عَلَيْهِمْ فَقَالُوا لاَ إِلاَّ أَنْ يَكُونَ لَنَا الْوَلاَءُ‏.‏ قَالَتْ عَائِشَةُ فَدَخَلْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَذَكَرْتُ ذَلِكَ لَهُ‏.‏ فَقَالَ لَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ اشْتَرِيهَا فَأَعْتِقِيهَا، فَإِنَّمَا الْوَلاَءُ لِمَنْ أَعْتَقَ ‏"‏‏.‏ ثُمَّ قَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ مَا بَالُ رِجَالٍ يَشْتَرِطُونَ شُرُوطًا لَيْسَتْ فِي كِتَابِ اللَّهِ، مَنِ اشْتَرَطَ شَرْطًا لَيْسَ فِي كِتَابِ اللَّهِ فَهْوَ بَاطِلٌ، شَرْطُ اللَّهِ أَحَقُّ وَأَوْثَقُ ‏"‏‏.‏

Narrated `Urwa: That `Aisha told him that Buraira came to seek her help in her writing of emancipation (for a certain sum) and that time she had not paid anything of it. `Aisha said to her, "Go back to your masters, and if they agree that I will pay the amount of your writing of emancipation and get your Wala', I will do so." Buraira informed her masters of that but they refused and said, "If she (i.e. `Aisha) is seeking Allah's reward, then she can do so, but your Wala' will be for us." `Aisha mentioned that to Allah's Apostle who said to her, "Buy and manumit her, as the Wala' is for the liberator." Allah's Messenger then got up and said, "What about the people who stipulate conditions which are not present in Allah's Laws? Whoever imposes conditions which are not present in Allah's Laws, then those conditions will be invalid, even if he imposed these conditions a hundred times. Allah's conditions (Laws) are the truth and are more solid."

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، أَنَّ عَائِشَةَ ـ رضى الله عنها ـ أَخْبَرَتْهُ أَنَّ بَرِيرَةَ جَاءَتْ تَسْتَعِينُهَا فِي كِتَابَتِهَا، وَلَمْ تَكُنْ قَضَتْ مِنْ كِتَابَتِهَا شَيْئًا، قَالَتْ لَهَا عَائِشَةُ ارْجِعِي إِلَى أَهْلِكِ، فَإِنْ أَحَبُّوا أَنْ أَقْضِيَ عَنْكِ كِتَابَتَكِ، وَيَكُونَ وَلاَؤُكِ لِي فَعَلْتُ‏.‏ فَذَكَرَتْ ذَلِكَ بَرِيرَةُ لأَهْلِهَا فَأَبَوْا وَقَالُوا إِنْ شَاءَتْ أَنْ تَحْتَسِبَ عَلَيْكِ فَلْتَفْعَلْ، وَيَكُونَ وَلاَؤُكِ لَنَا، فَذَكَرَتْ ذَلِكَ لِرَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ لَهَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ ابْتَاعِي فَأَعْتِقِي، فَإِنَّمَا الْوَلاَءُ لِمَنْ أَعْتَقَ ‏"‏‏.‏ قَالَ ثُمَّ قَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ مَا بَالُ أُنَاسٍ يَشْتَرِطُونَ شُرُوطًا لَيْسَتْ فِي كِتَابِ اللَّهِ مَنِ اشْتَرَطَ شَرْطًا لَيْسَ فِي كِتَابِ اللَّهِ فَلَيْسَ لَهُ، وَإِنْ شَرَطَ مِائَةَ مَرَّةٍ، شَرْطُ اللَّهِ أَحَقُّ وَأَوْثَقُ ‏"‏‏.‏