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.
bayhaqi:8184ʿAlī b. Aḥmad b. ʿAbdān > Aḥmad b. ʿUbayd > ʿUbayd b. Sharīk > Ibn Abū Maryam > Muḥammad b. Jaʿfar > Muḥammad b. Abū Ḥarmalah > Kurayb > Ibn ʿAbbās

[Machine] He heard Ibn Abbas say that the Prophet of Allah ﷺ commanded us to fast upon sighting the crescent moon and to break our fast upon sighting it. But if it is cloudy and we are unable to see it, then we complete the thirty days.  

البيهقي:٨١٨٤أَخْبَرَنَا عَلِيُّ بْنُ أَحْمَدَ بْنِ عَبْدَانَ أنبأ أَحْمَدُ بْنُ عُبَيْدٍ ثنا عُبَيْدُ بْنُ شَرِيكٍ ثنا ابْنُ أَبِي مَرْيَمَ أنبأ مُحَمَّدُ بْنُ جَعْفَرٍ أَخْبَرَنِي مُحَمَّدُ بْنُ أَبِي حَرْمَلَةَ أَخْبَرَنِي كُرَيْبٌ

أَنَّهُ سَمِعَ ابْنَ عَبَّاسٍ يَقُولُ أَمَرَنَا رَسُولُ اللهِ ﷺ أَنْ نَصُومَ لِرُؤْيَةِ الْهِلَالِ وَنُفْطِرَ لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْنَا أَنْ نُكْمِلَ ثَلَاثِينَ  


See similar narrations below:

Collected by Aḥmad
ahmad:9556Yaḥyá b. Saʿīd > Shuʿbah > Muḥammad b. Ziyād > Abū Hurayrah

Observe fast on sighting it (the new moon) and break (fast) on sighting it (the new moon), but if the sky is cloudy for you, then complete the number (of thirty). (Using translation from Muslim 1081b)  

أحمد:٩٥٥٦حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ عَنْ شُعْبَةَ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ زِيَادٍ عَنْ أَبِي هُرَيْرَةَ

عَنِ النَّبِيِّ ﷺ قَالَ صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَأَكْمِلُوا الْعِدَّةَ ثَلَاثِينَ  

ahmad:9376ʿAffān > Ḥammād b. Salamah > Muḥammad b. Ziyād > Abū Hurayrah > Abū al-Qāsim ﷺ

[Machine] I heard Abu al-Qasim ﷺ say, "Fast when you see the crescent moon and break your fast when you see it. But if it is cloudy for you, then complete thirty days."  

أحمد:٩٣٧٦حَدَّثَنَا عَفَّانُ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ أَخْبَرَنَا مُحَمَّدُ بْنُ زِيَادٍ قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ

سَمِعْتُ أَبَا الْقَاسِمِ ﷺ يَقُولُ صُومُوا الْهِلَالَ لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ  

ahmad:10060ʿAbd al-Raḥman > Ḥammād > Muḥammad b. Ziyād > Abū Hurayrah > Abū al-Qāsim ﷺ

[Machine] I heard Abu Al-Qasim ﷺ saying: "Fast when you see it (the new moon) and break your fast when you see it. But if it is cloudy for you, then complete the thirty (days of the previous month)."  

أحمد:١٠٠٦٠حَدَّثَنَا عَبْدُ الرَّحْمَنِ حَدَّثَنَا حَمَّادٌ عَنْ مُحَمَّدِ بْنِ زِيَادٍ قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ

سَمِعْتُ أَبَا الْقَاسِمِ ﷺ يَقُولُ صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ