Narrated Sa`d: I heard the Prophet saying, "Whoever claims to be the son of a person other than his father, and he knows that person is not his father, then Paradise will be forbidden for him."
Hadith Referenceصحيح البخاري / كتاب الفرائض / 6766
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Narrated Abu Huraira: The Prophet said, "Do not deny your fathers (i.e. claim to be the sons of persons other than your fathers), and whoever denies his father, is charged with disbelief."
Hadith Referenceصحيح البخاري / كتاب الفرائض / 6768
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة