Musnad Ahmad 14159

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].

"‏من ادعى إلى غير أبيه وهو يعلم أنه غير أبيه، فالجنة عليه حرام‏"

+ 12 other versions

I heard the Messenger of Allah (ﷺ) saying, "If somebody accuses another of disbelief or calls him the enemy of Allah, such an accusation will revert to him (the accuser) if the accused is innocent." [Al-Bukhari and Muslim].

"‏من دعا رجلا بالكفر، أو قال‏:‏ عدو الله، وليس كذلك إلا حار عليه‏"

Narrated by Abu Dharr + 7 other versions

if a man becomes the client of any people without the permission of his patrons (i.e. those who have freed him), on him will be the curse of Allah, of angels and of all people; no obligatory or supererogatory worship will be accepted from him.

مَنْ تَوَلَّى قَوْمًا بِغَيْرِ إِذْنِ مَوَالِيهِ فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ لاَ يُقْبَلُ مِنْهُ يَوْمَ الْقِيَامَةِ عَدْلٌ وَلاَ صَرْفٌ ‏"

Narrated by Abu Hurayrah + 7 other versions

Anyone falsely claims to be the son of other than his father, knowing that he is not his father, will be forbidden to enter Paradise

Sa‘d ibn Abi Waqqās (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Anyone falsely claims to be the son of other than his father, knowing that he is not his father, will be forbidden to enter Paradise."

مَنِ ادَّعَى إِلَى غَيْرِ أَبِيهِ وَهُوَ يَعْلَمُ أَنَّهُ غَيْرُ أَبِيهِ فَالْجَنَّةُ عَلَيْهِ حَرَامٌ ‏"

Narrated by Abu Bakrah + 2 other versions Explained

“Whoever claims to belong to someone other than his father, or (a freed slave) who claims that his Wala is for other than his real master, the curse of Allah (SWT), the angels and all the people will be upon him.”

"‏ مَنِ انْتَسَبَ إِلَى غَيْرِ أَبِيهِ أَوْ تَوَلَّى غَيْرَ مَوَالِيهِ فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ ‏"

Narrated by Ibn ‘Abbās + 3 other versions

My ears heard it end my heart remembered it from Muhammad (May peace be upon him) who said: if a man claims to be the son of a man who is not his father, paradise will be forbidden for him. He said: I then met Abu Bakrah and mentioned it to him. He said: my ears heard it and my heart remembered it…

حَدَّثَنَا النُّفَيْلِيُّ، حَدَّثَنَا زُهَيْرٌ، حَدَّثَنَا عَاصِمٌ الأَحْوَلُ، قَالَ حَدَّثَنِي أَبُو عُثْمَانَ، قَالَ حَدَّثَنِي سَعْدُ بْنُ مَالِكٍ، قَالَ سَمِعَتْهُ أُذُنَاىَ، وَوَعَاهُ، قَلْبِي مِنْ مُحَمَّدٍ…

Narrated by Abu Sa‘īd al-Khudri