It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that when revelation came down upon the Messenger of Allah (peace and blessings be upon him), it weighed heavily upon him (peace and blessings be upon him), and the people would refrain from speaking to him (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11839