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
ibnmajah:1753 – Hishām b. ʿAmmār > al-Walīd b. Muslim > Isḥāq b. ʿUbaydullāh al-Madanī > ʿAbdullāh b. Abū Mulaykah > ʿAbdullāh b. ʿAmr b. al-ʿĀṣ

“When the fasting person breaks his fast, his supplication is not turned back.” (One of the narrators) Ibn Abi Mulaikah said: "When he broke his fast, I heard 'Abdullah bin 'Amr say: 'O Allah! I ask You by Your mercy, which encompasses all things, to forgive me.'"  

ابن ماجة:١٧٥٣ – حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ حَدَّثَنَا إِسْحَاقُ بْنُ عُبَيْدِ اللَّهِ الْمَدَنِيُّ قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ أَبِي مُلَيْكَةَ يَقُولُ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عَمْرِو بْنِ الْعَاصِ يَقُولُ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ لِلصَّائِمِ عِنْدَ فِطْرِهِ لَدَعْوَةً مَا تُرَدُّ قَالَ ابْنُ أَبِي مُلَيْكَةَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عَمْرٍو يَقُولُ إِذَا أَفْطَرَ اللَّهُمَّ إِنِّي أَسْأَلُكَ بِرَحْمَتِكَ الَّتِي وَسِعَتْ كُلَّ شَىْءٍ أَنْ تَغْفِرَ لِي  

See similar narrations below:

Collected by Ḥākim
hakim:1535 – Abū Muḥammad ʿAbd al-ʿAzīz b. ʿAbd al-Raḥman al-Dabbās Bimakkah > Muḥammad b. ʿAlī b. Zayd > al-Ḥakam b. Mūsá > al-Walīd b. Muslim > Isḥāq b. ʿAbdullāh > ʿAbdullāh b. Abū Mulaykah > ʿAbdullāh b. ʿAmr b. al-ʿĀṣ

[Machine] I heard the Messenger of Allah ﷺ say, "Verily, the fasting person has a supplication at the time of breaking his fast, O Allah, I ask You by Your mercy which encompasses everything, to forgive my sins." This is reported by Ishaq if Ibn Abdullah is his freed slave. Muslim did not report it if Ibn Abi Farwah is the one reporting it.  

الحاكم:١٥٣٥ – أَخْبَرَنَا أَبُو مُحَمَّدٍ عَبْدُ الْعَزِيزِ بْنُ عَبْدِ الرَّحْمَنِ الدَّبَّاسُ بِمَكَّةَ ثنا مُحَمَّدُ بْنُ عَلِيِّ بْنِ زَيْدٍ ثنا الْحَكَمُ بْنُ مُوسَى ثنا الْوَلِيدُ بْنُ مُسْلِمٍ ثنا إِسْحَاقُ بْنُ عَبْدِ اللَّهِ قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ أَبِي مُلَيْكَةَ يَقُولُ سَمِعْتُ عَبْدَ اللَّهِ بْنَ عَمْرِو بْنِ الْعَاصِ يَقُولُ

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «إِنَّ لِلصَّائِمِ عِنْدَ فِطْرِهِ دَعْوَةً اللَّهُمَّ إِنِّي أَسْأَلُكَ بِرَحْمَتِكَ الَّتِي وَسِعَتْ كُلَّ شَيْءٍ أَنْ تَغْفِرَ لِي ذُنُوبِي» إِسْحَاقُ هَذَا إِنْ كَانَ ابْنَ عَبْدِ اللَّهِ مَوْلَى زَائِدَةَ فَقَدْ خَرَّجَ عَنْهُ مُسْلِمٌ وَإِنْ كَانَ ابْنَ أَبِي فَرْوَةَ فَإِنَّهُمَا لَمْ يُخَرِّجَاهُ