حَدَّثَنَا وَكِيعٌ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ نَافِعٍ عَنْ أَبِيهِ عَنِ ابْنِ عُمَرَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَعْنِي أُتِيَ بِفَضِيخٍ فِي مَسْجِدِ الْفَضِيخِ فَشَرِبَهُ فَلِذَلِكَ سُمِّيَ
مسند امام احمد بن حنبل · Hadith 5844
It was narrated from Ibn 'Umar that some fadeekh (a drink made from unripe dates) was brought to the Prophet (PBUH) in Masjid al-Fadeekh (the mosque of ai-Fadeekh) and he drank it, and (the mosque) was named after that.
Sanad
حَدَّثَنَا وَكِيعٌ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ نَافِعٍ عَنْ أَبِيهِ عَنِ ابْنِ عُمَرَ