Narrated Abu Huraira through different narrators that the Prophet said, "It is Allah's right on every Muslim that he should take a bath (at least) once in seven days."
Hadith ReferenceSahih Bukhari / The Book of Al-Jumuah (Friday) / Hadith: 898
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة