ʿUyūn akhbār al-Riḍā
Hadith 137137 - وَبِهذَا الإِسنادِ عَنْ عَلِىِّ بْنِ أَبِي طالِبٍ عَلَيْهِالسَّلامُ قالَ: عَلَيْكُمْ بِالقَرعِ، فَإِنَّهُ يَزِيدُ فِي الدِّماغِ.
31-137 According to the same documentation, Ali ibn Abi Talib (a.s.) said, “I advise you to eat gourds since they strengthen mental powers.”