On Miscellaneous Topics
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 28
وَقَالَ اِبْنُ أَبِي لَيْلَى لِلصَّادِقِ عَلَيْهِ اَلسَّلاَمُ: أَيُّ شَيْءٍ أَحْلَى مِمَّا خَلَقَ اَللَّهُ عَزَّ وَ جَلَّ فَقَالَ «اَلْوَلَدُ اَلشَّابُّ» فَقَالَ أَيُّ شَيْءٍ أَمَرُّ مِمَّا خَلَقَ اَللَّهُ عَزَّ وَ جَلَّ قَالَ «فَقْدُهُ» فَقَالَ أَشْهَدُ أَنَّكُمْ حُجَجُ اَللَّهِ عَلَى خَلْقِهِ.
Ibn Abi Layla said to Imam Jafar ibn Muhammad Al-Sadiq عليه السلام: "What is the sweetest of what Allah سبحانه وتعالى, the Mighty and Majestic, has created?" Imam عليه السلام replied: "A young child." Ibn Abi Layla then asked: "What is the most bitter of what Allah سبحانه وتعالى has created?" The Imam answered: "Losing him." Ibn Abi Layla then said: "I testify that you are the proofs of Allah سبحانه وتعالى for His creation."
- Ṣaḥīḥ al-Faqīh