Narrated Abdullah ibn Umar: The Prophet ﷺ said: The month consists of twenty-nine days, but do not fast till you sight it (the moon) and do not break your fast till you sight it. If the weather is cloudy, calculate it thirty days. When the twenty-ninth of Sha'ban came, Ibn Umar would send someone (who tried) to sight the moon for him. If it was sighted, then well and good; in case it was not sighted, and there was no cloud and dust before him (on the horizon), he would not keep fast the next day. If there appeared (on the horizon) before him cloud or dust, he would fast the following day. Ibn Umar would end his fasting alone with the people, and did not follow this calculation.
Hadith Referenceسنن ابي داود / كتاب الصيام / 2319
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح بخاري (1913) صحيح مسلم (108)
Hadith Takhrij« صحیح البخاری/الصوم 13(1913)، صحیح مسلم/الصوم 2 (1080)، سنن النسائی/الصیام 8 (2142)، (تحفة الأشراف: 7075)، وقد أخرجہ: سنن ابن ماجہ/الصیام 6 (1654)، مسند احمد (2/122) (صحیح) »
Ibn Umar reported the Messenger of Allah ﷺ as saying “The month consists of twenty nine days, but do not fast till you sight it (the moon) and do not break your fast till you sight it. If the weather is cloudy, calculate it thirty days. When the twenty-ninth of Sha’ban came, Ibn Umar would send someone (who tried) to sight the moon for him. If it was sighted then well and good, in case it was not sighted and there was no cloud and dust before him (on the horizon) he would not keep fast the next day. If there appeared (on the horizon) before him cloud or dust, he would fast the following day. Ibn Umar would end his fasting alone with the people and did not follow this calculation. ”
Hadith Referenceسنن ابي داود / كتاب الصيام / 2320
Hadith Gradingالألبانی:صحيح قد دون قوله فكان ابن عمر | زبیر علی زئی:صحيح مسلم (1080)
Hadith Takhrij« صحیح مسلم/الصوم 2(1080)،(تحفة الأشراف: 7536، 19146)، وقد أخرجہ: مسند احمد (2/5) (صحیح) »
Narrated Ayyub: Umar bin Abd al-Aziz wrote (a letter) to the people of Basrah: It has reached us from the Messenger of Allah ﷺ, like the tradition narrated by Ibn Umar from the Prophet ﷺ. This version adds: The best calculation is that when we sight the moon of Sha'ban on such-and-such date, fasting will being on such-and-such dates, Allah willing, except they they sight the moon before that (date).
Hadith Referenceسنن ابي داود / كتاب الصيام / 2321
Hadith Gradingالألبانی:صحيح مقطوع | زبیر علی زئی:ضعيف, إسناده ضعيف, الحديث مرسل ولم يخبر الإمام عمر بن عبد العزيز ممن بلغه به, انوار الصحيفه، صفحه نمبر 87
Hadith Takhrij« تفرد بہ أبو داود، (تحفة الأشراف: 7536 و 19146) (صحیح) »