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. (Using translation from Abū Dāʾūd 3284)
أَنَّ رَجُلًا أَتَى النَّبِيَّ ﷺ بِجَارِيَةٍ سَوْدَاءَ أَعْجَمِيَّةٍ فَقَالَ يَا رَسُولَ اللهِ إِنَّ عَلَيَّ عِتْقَ رَقَبَةٍ مُؤْمِنَةٍ فَقَالَ لَهَا رَسُولُ اللهِ أَيْنَ اللهُ؟ فَأَشَارَتْ إِلَى السَّمَاءِ بِإِصْبَعِهَا السَّبَّابَةِ فَقَالَ لَهَا مَنْ أَنَا؟ فَأَشَارَتْ بِإِصْبَعِهَا إِلَى رَسُولِ اللهِ وَإِلَى السَّمَاءِ أَيْ أَنْتَ رَسُولُ اللهِ فَقَالَ أَعْتِقْهَا