Mishkat al-Masabih 29 Excellent Qualities and Description of the Prophet كتاب الفضائل والشمائل 182

وَعَنِ ابْنِ عَبَّاسٍ قَالَ جَاءَ أَعْرَابِيٌّ إِلَى رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: بِمَا أَعْرِفُ أَنَّكَ نَبِيٌّ؟ قَالَ: «إِنْ دَعَوْتَ هَذَا الْعِذْقَ مِنْ هَذِهِ النَّخْلَةِ يَشْهَدُ أَنِّي رَسُولُ اللَّهِ» فَدَعَاهُ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَجَعَلَ يَنْزِلُ مِنَ النَّخْلَةِ حَتَّى سَقَطَ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ثُمَّ قَالَ: «ارْجِعْ» فَعَادَ فَأَسْلَمَ الْأَعْرَابِيُّ. رَوَاهُ التِّرْمِذِيّ وَصَححهُ

Ibn ‘Abbas told that a nomadic Arab came to God’s messenger and asked, “By what means can I know that you are a prophet?” He replied, “If I call this raceme from this palm-tree it will testify that I am God’s messenger.” He called it and it began to come down from the palm-tree and fell beside the Prophet. He then told it to go back, and when it returned the nomadic Arab accepted Islam. Tirmidhi transmitted it, saying it is sahih.