Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:12260a –
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السيوطي:١٢٢٦٠a –

"بحَسْب امْرِئٍ يَدْعُو أَنْ يَقُولَ: اللَّهُمَّ اغْفرْ لِي وَارْحَمْنِى، وَأَدْخِلنِى الجَنَّةَ".  

[طب] الطبرانى في الكبير عن السائب بن يزيد

See similar narrations below:

Collected by Ṭabarānī
tabarani:6670 – Abū al-Zinbāʿ Rawḥ b. al-Faraj > Yaḥyá b. Bukayr > Ibn Lahīʿah > Muḥammad b. ʿAbd al-Raḥman b. Nawfal > Yazīd b. Khuṣayfah > al-Sāʾib b. Yazīd

[Machine] That the Prophet Muhammad (PBUH) used to say that it is enough for a person to ask God by saying, "Oh Allah, forgive me, have mercy on me, and enter me into Paradise."  

الطبراني:٦٦٧٠ – حَدَّثَنَا أَبُو الزِّنْبَاعِ رَوْحُ بْنُ الْفَرَجِ ثنا يَحْيَى بْنُ بُكَيْرٍ حَدَّثَنِي ابْنُ لَهِيعَةَ عَنْ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ نَوْفَلٍ عَنْ يَزِيدَ بْنِ خُصَيْفَةَ عَنِ السَّائِبِ بْنِ يَزِيدَ

أَنَّ النَّبِيَّ ﷺ كَانَ يَقُولُ بِحَسْبِ امْرِئٍ أَنْ يَدْعُوَ أَنْ يَقُولَ اللهُمَّ اغْفِرْ لِي وَارْحَمْنِي وَأَدْخِلْنِي الْجَنَّةَ