Hadith 3685
عَنْ عِكْرِمَةَ قَالَ: سَمِعْتُ ابْنَ عَبَّاسَ رَضِيَ اللَّهُ عَنْهُمَا يَقُولُ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ، فَإِنْ حَالَ بَيْنَكُمْ وَبَيْنَهُ سَحَابٌ فَكَمِّلُوا الْعِدَّةَ ثَلَاثِينَ، وَلَا تَسْتَقْبِلُوا الشَّهْرَ اسْتِقْبَالًا))، قَالَ حَاتِمٌ: يَعْنِي عِدَّةَ شَعْبَانَ
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Begin fasting by sighting the moon and stop fasting by sighting the moon. If clouds come between you and the moon, then complete the count (thirty) of the previous month, and do not fast just before (the arrival of) the month of Ramadan. Hatim, the narrator, says: The Prophet (peace and blessings be upon him) meant that the count of Sha'ban should be completed.
Hadith 3686
((وَعَنْهُ مِنْ طَرِيقٍ ثَانٍ)، مِثْلُهُ وَفِيهِ:) فَإِنْ حَالَ دُونَهُ غَيَابَةٌ، فَأَكْمِلُوا الْعِدَّةَ، وَالشَّهْرُ تِسْعٌ وَعِشْرُونَ))، يَعْنِي أَنَّهُ نَاقِصٌ
. (Second chain) It is stated in this: If a cloud comes between you and the moon, then complete the counting, and the month can also be of (29) days. That is, it can also be one day less than thirty (30).
Hadith 3687
عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ يَتَحَفَّظُ مِنْ هِلَالِ شَعْبَانَ مَا لَا يَتَحَفَّظُ مِنْ غَيْرِهِ، ثُمَّ يَصُومُ بِرُؤْيَةِ رَمَضَانَ، فَإِنَّ غُمَّ عَلَيْهِ عَدَّ ثَلَاثِينَ يَوْمًا ثُمَّ صَامَ
It is narrated from Sayyida Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) used to pay more attention to the crescent of Sha'ban than to the crescent of any other month. Then, when the crescent of Ramadan was sighted, he would begin fasting, and if the sky was cloudy, he would complete the count of thirty days of (Sha'ban), and then begin fasting.