Al-Kāfi - Volume 6 > Al-Sadab (Rue Herb of Grace)
Hadith #1

مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى عَنْ يَعْقُوبَ بْنِ عَامِرٍ عَنْ رَجُلٍ عَنْ أَبِي الْحَسَنِ ( عليه السلام ) قَالَ السَّدَابُ يَزِيدُ فِي الْعَقْلِ .

1. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad ibn ‘Isa from Ya’qub ibn ‘Amir from a man who has said the following: “Abu al-Hassan, ‘Alayhi al-Salam, has said, ‘Al-Sadab (Rue herb of grace) increases the power of understanding.’”