Hameed bin Musa'da bin al-Mubarak حميد بن مسعدة بن المبارك · Fasting (Kitab Al-Siyam)

Ibn ‘Umar reported the Apostle of Allaah(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…

The Messenger of Allah (ﷺ) as saying: None of you must fast on Friday unless he fasts the day before or the day after.