Narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that when Sayyiduna Ghailan bin Salamah Thaqafi entered the fold of Islam, he had ten wives in his marriage. The Prophet (peace and blessings be upon him) said to him: "Choose four of them (and leave the rest)."
Hadith Takhrij«حديث صحيح بطرقه وشواهده، أخرجه ابن ماجه: 1953، والترمذي: 1128، (انظر مسند أحمد ترقيم الرسالة: 4609 ترقیم بيت الأفكار الدولية: 4609»
Brief Explanation
Benefits: … The wording of the narration in Tirmidhi is as follows: "He accepted Islam and had ten wives in the period of ignorance (Jahiliyyah), so they also accepted Islam along with him." … When he became Muslim, he had ten wives, and they too became Muslim with him. There is no such restriction in this (narration) that he should only keep those four wives in his marriage whom he had married first.