Sayyiduna Ibn Umar (may Allah be pleased with him) used to say: "Whoever marries his freed slave woman, it is as if he is riding a sacrificial animal." Ibrahim Nakha'i (may Allah have mercy on him) and his companions did not see any harm in this and preferred that freedom itself be made the dowry.
Hadith Referenceسنن سعید بن منصور / كتاب النكاح / 2092
Hadith Gradingمحدثین:إسنادہ صحیح
Hadith Takhrij«إسنادہ صحیح، وأخرجه سعيد بن منصور فى «سننه» ترقيم الدرالسلفية برقم:، 915، 916، وابن أبى شيبة فى «مصنفه» برقم: 15160، 16406»