ʿUyūn akhbār al-Riḍā
Hadith 88 - وَبِهذَا الإِسنادِ قالَ: قالَ رَسُولُ اللَّهِ صَلَّى اللهُعَلَيْهِ وَآلِهِ: الوَلَدُ رِيحانَةٌ، وَرَيحانَتايَ الحَسَنُ وَالحُسَيْنُ.
31-8 According to the same documentation, God’s Prophet (S) said, “Children are like basil. And Al-Hassan and Al-Husayn are my basil.”