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.
hakim:1641Abū al-ʿAbbās Muḥammad b. Yaʿqūb > al-ʿAbbās b. al-Walīd b. Mazyad al-Bayrūtī from my father > al-Awzāʿī > ʿAbdullāh b. ʿĀmir > Nāfiʿ > Ibn ʿUmar > Rasūl

[Machine] The Messenger of Allah ﷺ said, "Whoever performs an extra voluntary deed and then becomes uncertain, if he wishes he can replace it and if he wishes he can leave it. But if it was a vow, then he must replace it."  

الحاكم:١٦٤١حَدَّثَنَا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ أَنْبَأَ الْعَبَّاسُ بْنُ الْوَلِيدِ بْنِ مَزْيَدٍ الْبَيْرُوتِيُّ ثنا أَبِي ثنا الْأَوْزَاعِيُّ حَدَّثَنِي عَبْدُ اللَّهِ بْنُ عَامِرٍ حَدَّثَنِي نَافِعٌ عَنِ ابْنِ عُمَرَ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مَنْ أَهْدَى تَطَوُّعًا ثُمَّ ضَلَّتْ فَإِنْ شَاءَ أَبْدَلَهَا وَإِنْ شَاءَ تَرَكَ وَإِنْ كَانَتْ فِي نَذْرٍ فَلْيُبَدِّلْ»  

هَذَا حَدِيثٌ صَحِيحُ الْإِسْنَادِ وَلَمْ يُخَرِّجَاهُ

See similar narrations below:

Collected by Bayhaqī, Suyūṭī
bayhaqi:10258[Chain 1] Abū ʿAbdullāh Isḥāq b. Muḥammad b. Yūsuf al-Sūsī > Abū al-ʿAbbās al-Aṣam > al-ʿAbbās b. al-Walīd b. Mazyad from my father > al-Awzāʿī [Chain 2] Abū al-ʿAbbās > al-Rabīʿ b. Sulaymān > Bishr b. Bakr > al-Awzāʿī > ʿAbdullāh b. ʿĀmir > Nāfiʿ a freed slave of ʿAbdullāh b. ʿUmar > ʿAbdullāh b. ʿUmar

[Machine] From the Messenger of Allah ﷺ who said, "Whoever performs voluntary prayers and then becomes lost (confused), he may choose (to continue) or he may leave them. And if it (the confusion) is due to a vow, then he should fulfill it (by continuing the prayers). Al-Qarqasani narrated it from Al-Awza'i, and it contradicted the consensus in its wording."  

البيهقي:١٠٢٥٨أَخْبَرَنَا أَبُو عَبْدِ اللهِ إِسْحَاقُ بْنُ مُحَمَّدِ بْنِ يُوسُفَ السُّوسِيُّ ثنا أَبُو الْعَبَّاسِ الْأَصَمُّ أنا الْعَبَّاسُ بْنُ الْوَلِيدِ بْنِ مَزْيَدٍ أَخْبَرَنِي أَبِي ثنا الْأَوْزَاعِيُّ ح قَالَ وَثَنَا أَبُو الْعَبَّاسِ ثنا الرَّبِيعُ بْنُ سُلَيْمَانَ ثنا بِشْرُ بْنُ بَكْرٍ عَنِ الْأَوْزَاعِيِّ حَدَّثَنِي عَبْدُ اللهِ بْنُ عَامِرٍ حَدَّثَنِي نَافِعٌ مَوْلَى عَبْدِ اللهِ بْنِ عُمَرَ عَنْ عَبْدِ اللهِ بْنِ عُمَرَ

عَنْ رَسُولِ اللهِ ﷺ قَالَ مَنْ أَهْدَى تَطَوُّعًا ثُمَّ ضَلَّتْ فَإِنْ شَاءَ أَبْدَلَهَا وَإِنْ شَاءَ تَرَكَ وَإِنْ كَانَتْ فِي نَذْرٍ فَلْيُبَدِّلْ وَرَوَاهُ الْقَرْقَسَانِيُّ عَنِ الْأَوْزَاعِيِّ فَخَالَفَ الْجَمَاعَةَ فِي مَتْنِهِ  

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السيوطي:٢٠٩٠٣a

"مَنْ أَهْدَى تَطَوعًا ثُمَّ ضَلَّتْ، فَإِنْ شَاءَ أَبْدَلَهَا، وَإِنْ شَاءَ تَرَكَ وَإنْ كَانَ في نَذْرٍ فَليُبْدِلْ".  

[ك] الحاكم في المستدرك [ق] البيهقى في السنن عن ابن عمر