Sayyiduna Ghaylan bin Salamah (may Allah be pleased with him) said that Abu al-Sa'ib Rafi' (may Allah be pleased with him), who was Ghaylan's slave, fled to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) freed him. Then Ghaylan (may Allah be pleased with him) also accepted Islam, and the Prophet (peace and blessings be upon him) returned his wala to Ghaylan (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الولاء / 21529