Narrated Abdullah ibn Umar: The Prophet صلی اللہ علیہ وسلم 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.

Ibn Umar reported the Messenger of Allah صلی اللہ علیہ وسلم 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. ”

Narrated Ayyub: Umar bin Abd al-Aziz wrote (a letter) to the people of Basrah: It has reached us from the Messenger of Allah صلی اللہ علیہ وسلم , like the tradition narrated by Ibn Umar from the Prophet صلی اللہ علیہ وسلم . 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).

Narrated Abdullah ibn Masud: We kept fast for twenty-nine days along with the Prophet صلی اللہ علیہ وسلم more often than we kept fast for thirty days.

Narrated Abu Bakrah: The Prophet صلی اللہ علیہ وسلم as saying: The two months of Eid (festival), Ramadan and Dhu al-Hijjah, are not defective.