وَعَن سفينة
قَالَ: كُنْتُ مَمْلُوكًا لِأُمِّ سَلَمَةَ فَقَالَتْ: أُعْتِقُكَ وَأَشْتَرِطُ عَلَيْكَ أَنْ تَخْدُمَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: مَا عِشْتَ فَقُلْتُ: إِنْ لَمْ تَشْتَرِطِي عَلَيَّ مَا فَارَقْتُ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: مَا عِشْتُ فَأَعْتَقَتْنِي وَاشْتَرَطَتْ عَلَيَّ
I was a slave of Umm Salamah, and she said, “I shall emancipate you, but I stipulate that you must serve God’s Messenger as long as you live” I replied, “Even if you do not make a stipulation with me I shall not leave God’s Messenger as long as I live”. She then emancipated me and made the stipulation with me.
Mishkat al-Masabih 3265, Book 15, Emancipation, Hadith 17. 1 min read