ENOfficial
Sa‘d b. Abu Waqqas and Abu Bakra reported God’s Messenger as saying, "If anyone knowingly claims as father one who is not his father, paradise is forbidden to him.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ وَأَبِي بَكْرَةَ قَالَا: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنِ ادَّعَى إِلَى غَيْرِ أَبِيهِ وَهُوَ يَعْلَمُ أَنَّهُ غَيْرُ أَبِيهِ فَالْجَنَّةُ عَلَيْهِ حرَام»
sunnah.com