Hadith 1166B2

قَالَ مَالِكٌ : لَا بَأْسَ بِأَنْ تَفْتَدِيَ الْمَرْأَةُ مِنْ زَوْجِهَا بِأَكْثَرَ مِمَّا أَعْطَاهَا
Imam Malik, may Allah have mercy on him, said: If a woman frees herself by giving more than what her husband gave her, there is nothing objectionable in it.
Hadith Reference موطا امام مالك رواية يحييٰ / كتاب الطلاق / 1166B2
Hadith Takhrij «فواد عبدالباقي نمبر: 29 - كِتَابُ الطَّلَاقِ-ح: 32»