It is narrated from Hazrat Buraidah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Truffle is a cure for the eyes, Ajwa is a fruit from Paradise, and this black seed which is in salt is a cure for every disease except death.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22938
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف، واصل بن حيان غلط فى اسمه زهير، والصواب: صالح بن حيان، وهذا ضعيف