Al-Kāfi

Hadith 276
tanzih
7ـ سَهْلٌ عَنِ السِّنْدِيِّ بْنِ الرَّبِيعِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ حَفْصٍ أَخِي مُرَازِمٍ عَنِ الْمُفَضَّلِ قَالَ سَأَلْتُ أَبَا الْحَسَنِ (عَلَيْهِ السَّلام) عَنْ شَيْ‏ءٍ مِنَ الصِّفَةِ فَقَالَ لا تَجَاوَزْ مَا فِي الْقُرْآنِ.
7. Sahl has narrated from al-Sindi ibn al-Rabi‘ from Ibn Abi ‘Umayr from Hafs, brother of Marazim from al-Mufaddal who has said the “I asked Imam abu al-Hassan (a.s.) about certain matters of the attributes (of Allah) and the Imam said, “Do not exceed what is in the holy Quran.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī