Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 25160a
"لاَ تقَدَّمُوا الشَّهْرَ بِيَوْمِ وَلا يَوْمَيْنِ إِلاَّ أَنْ يُوَافِقَ ذَلِكَ صَوْمًا كَانَ يَصُومُهُ أَحَدُكُمْ، صُومُوا لِرُؤْيَتِهِ، وَأَفْطِرُوا لِرُؤْيَتِهِ، فَإنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلاثِينَ ثُمَّ أَفْطِرُوا".
Translation
Machine translation, not reviewed
"Do not precede the month by a day or two days, unless that coincides with a fast that one of you used to keep. Fast when you see it, and break your fast when you see it. If it is obscured from you, then count thirty, then break your fast."
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Notes
[ت] الترمذي حسن صحيح، [ق] البيهقى في السنن عن أبى هريرة
Grades by grader
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