Al-Kāfi - Volume 6 > Squash
Hadith #5

عَنْهُ عَنْ عَلِيِّ بْنِ حَسَّانَ عَنْ مُوسَى بْنِ بَكْرٍ قَالَ سَمِعْتُ أَبَا الْحَسَنِ ( عليه السلام ) يَقُولُ الدُّبَّاءُ يَزِيدُ فِي الْعَقْلِ .

5. It is narrated from the narrator of the previous Hadith from Ali ibn Hassan from Musa ibn Bakr who has said the following: “I once heard abu al-Hassan, ‘Alayhi al-Salam, saying, ‘Squash, gourd increases power of reason.’”