A man brought the Prophet ﷺ a black slave girl. He said: Messenger of Allah, emancipation of believing slave is due to me. He asked her: Where is Allah ? She pointed to the heaven with her finger. He then asked her: Who am I ? She pointed to the Prophet ﷺ and to the heaven, that is to say: You are the Messenger of Allah. He then said: Set her free, she is a believer.
أَنَّ رَجُلاً أَتَى النَّبِيَّ ﷺ بِجَارِيَةٍ سَوْدَاءَ فَقَالَ يَا رَسُولَ اللَّهِ إِنَّ عَلَىَّ رَقَبَةً مُؤْمِنَةً فَقَالَ لَهَا أَيْنَ اللَّهُ فَأَشَارَتْ إِلَى السَّمَاءِ بِأُصْبُعِهَا فَقَالَ لَهَا فَمَنْ أَنَا فَأَشَارَتْ إِلَى النَّبِيِّ ﷺ وَإِلَى السَّمَاءِ يَعْنِي أَنْتَ رَسُولُ اللَّهِ فَقَالَ أَعْتِقْهَا فَإِنَّهَا مُؤْمِنَةٌ