Riyad as-Salihin, Book 18, Hadith 1802 (In-Book) ⓘ
Sa'd bin Abu Waqqas (May Allah be pleased with him) said: The Prophet said, "He who (falsely) attributes his fatherhood to anyone besides his real father, knowing that he is not his father, will be forbidden to enter Jannah."[Al-Bukhari and Muslim].
عن سعد بن أبي وقاص رضي الله عنه أن النبي صلى الله عليه وسلم قال: "من ادعى إلى غير أبيه وهو يعلم أنه غير أبيه، فالجنة عليه حرام" ((متفق عليه)).