It is narrated from Husayn al-Mu'allim (may Allah have mercy on him) that he said: "Muhammad bin Sirin (may Allah have mercy on him) would converse (in ordinary circumstances) and would also laugh, but when it came to narrating a blessed hadith of the Messenger of Allah (peace and blessings be upon him), a state of fear of Allah, humility and solemnity would come over him."
This report is sahih (authentic) and mawquf.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب العلم / 3055
Hadith Gradingمحدثین:إسناده صحيح، موقوف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: صَحِيحٌ مَوْقُوفٌ . » «انفرد به المصنف من هذا الطريق»