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:1594a –
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السيوطي:١٥٩٤a –

"إذَا جَاءَ رمضانُ فَصُمْ ثلاثين، إلَّا أنْ يُرَى الهلالُ قَبْلَ ذلك".  

[طب] الطبرانى في الكبير عن عدى بن حاتم

See similar narrations below:

Collected by Ṭabarānī
tabarani:14300 – ʿAlī b. ʿAbd al-ʿAzīz > Ibrāhīm b. Ḥumayd al-Ruʾāsī > Mujālid > al-Shaʿbī > ʿAdī b. Ḥātim

[Machine] "To me, the Messenger of Allah ﷺ said, 'When Ramadan comes, fast for thirty days unless you see the new moon before that.'"  

الطبراني:١٤٣٠٠ – حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ الْعَزِيزِ ثَنَا إِبْرَاهِيمُ بْنُ حُمَيْدٍ الرُّؤَاسِيُّ عَنْ مُجَالِدٍ عَنِ الشَّعْبِيِّ عَنْ عَدِيِّ بْنِ حَاتِمٍ قَالَ قَالَ

لِي رَسُولُ اللهِ ﷺ «إِذَا جَاءَ رَمَضَانُ فَصُمْ ثَلَاثِينَ إلَّا أَنْ تَرَى الْهِلَالَ قَبْلَ ذَلِكَ»