Sa'd bin Abu Waqqas (May Allah be pleased with him) said:
The Prophet (ﷺ) 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].
App reference: Book 18, Hadith 292
Arabic/English book reference: Book 18, Hadith 1802