The Book of Divine Unity · Hadith 572 (#Ḥadīth #32)
Chapter 67 | The Prohibition of Discussing, Debating, and Arguing about Allah
32 - أبي رحمه الله، قال: حدثنا سعد بن عبد الله، قال: حدثنا محمد بن الحسين عن محمد بن إسماعيل، عن الحضرمي، عن المفضل بن عمر، قال: قال أبو عبد الله عليه السلام: يا مفضل من فكر في الله كيف كان هلك، ومن طلب الرئاسة هلك.
32. My father said: Sa`d ibn `Abd Allah said: Muhammad ibn al-Husayn said, on the authority of Muhammad ibn Isma`il, on the authority of al-Hadrami, on the authority of alMufaddal ibn `Umar that Abu `Abd Allah al-Sadiq said: “O Mufaddal! Whoever speculates about the state of Allah is ruined, and whoever seeks power is ruined as well.”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).