It is narrated from Hazrat Asma (may Allah be pleased with her) that when Surah Al-Ma'idah was completely revealed to the Prophet (peace and blessings be upon him), I was holding the rein of his she-camel "Adba’", and due to the weight of the revelation, it felt as if the foreleg of the camel would break.
Hadith Referenceمسند احمد / من مسند القبائل / 27575
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف لضعف ليث، وشهر بن حوشب