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Narrated Abdullah bin Umar:

Allah's Apostle ﷺ said, "The month (can be) 29 nights (i.e. days), and do not fast till you see the moon, and if the sky is overcast, then complete Sha'ban as thirty days."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، حَدَّثَنَا مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
"‏ الشَّهْرُ تِسْعٌ وَعِشْرُونَ لَيْلَةً، فَلاَ تَصُومُوا حَتَّى تَرَوْهُ، فَإِنْ غُمَّ عَلَيْكُمْ فَأَكْمِلُوا الْعِدَّةَ ثَلاَثِينَ ‏"‏‏.‏

Classification

Sahih (Authentic)

References

• Sahih al-Bukhari, 1907
• Sahih al-Bukhari, Vol. 3, Book of Fasting, Hadith 131
• Sahih al-Bukhari, Book of Fasting, Hadith 131