I heard Messenger of Allah ﷺ saying, "When you see the crescent (of the month of Ramadan), start fasting, and when you see the crescent (of the month of Shawwal), stop fasting; and if the sky is overcast (and you can't see it) then regard the month of Ramadan as of 30 days."

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ وَقَالَ غَيْرُهُ عَنِ اللَّيْثِ حَدَّثَنِي عُقَيْلٌ وَيُونُسُ لِهِلاَلِ رَمَضَانَ

The month (of Ramadan) may consist of twenty nine days; so when you see the new moon observe fast and when you see (the new moon again at the commencement of the month of Shawwal) then break It, and if the sky is cloudy for you, then calculate it (and complete thirty days).

قَالَ رَسُولُ اللَّهِ ﷺ الشَّهْرُ تِسْعٌ وَعِشْرُونَ فَإِذَا رَأَيْتُمُ الْهِلاَلَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدِرُوا لَهُ

When you see the new moon, observe fast, and when you see it (again) then break it, and if the sky is cloudy for you, then calculate it.

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدِرُوا لَهُ

" I heard the messenger of Allah say: 'When you see the crescent then fast, and when you see it, then stop fasting, and if it is obscured from you (too cloudy), then work it out (fro the beginning of the month, to complete thirty days)"'

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ إِذَا رَأَيْتُمُ الْهِلاَلَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ

"The Messenger of Allah mentioned the crescent and said: 'When you see it, fast and when you see it, stop fasting, and if it is obscured from you (too cloudy), then count thirty days."'

ذَكَرَ رَسُولُ اللَّهِ ﷺ الْهِلاَلَ فَقَالَ إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلاَثِينَ

" I heard the messenger of Allah say: 'When you see the crescent then fast, and when you see it, then stop fasting, and if it is obscured from you (too cloudy), then work it out (fro the beginning of the month, to complete thirty days)"' (Using translation from Nasāʾī 2120)

قَالَ رَسُولُ اللهِ ﷺ إِذَا رَأَيْتُمُ الْهِلَالَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ

" I heard the messenger of Allah say: 'When you see the crescent then fast, and when you see it, then stop fasting, and if it is obscured from you (too cloudy), then work it out (fro the beginning of the month, to complete thirty days)"' (Using translation from Nasāʾī 2120)

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ»

"When you see the crescent then fast, and when you crescent then fast, and when you see it, stop fasting. If it is obscured from you (too cloudy), then fast thirty days." (Using translation from Nasāʾī 2119)

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ «إِذَا رَأَيْتُمُ الْهِلَالَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ»

When you see the new moon, observe fast, and when you see it (again) then break it, and if the sky is cloudy for you, then calculate it. (Using translation from Muslim 1080g)

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ «إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا لَهُ»

“When you see the new crescent then fast, and when you see it then stop fasting. If it is cloudy then fast thirty days.” (Using translation from Ibn Mājah 1655)

قَالَ رَسُولُ اللهِ ﷺ إِذَا رَأَيْتُمُ الْهِلَالَ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ غُمَّ عَلَيْكُمْ فَصُومُوا ثَلَاثِينَ يَوْمًا

[Machine] The Messenger of Allah ﷺ mentioned the sighting of the new moon and said, "When you see it, start fasting, and when you see it again, break your fast. But if it is cloudy and you are unable to see it, then complete the month as thirty days."

ذَكَرَ رَسُولُ اللهِ ﷺ الْهِلَالَ فَقَالَ إِذَا رَأَيْتُمُوهُ فَصُومُوا وَإِذَا رَأَيْتُمُوهُ فَأَفْطِرُوا فَإِنْ أُغْمِيَ عَلَيْكُمْ فَعُدُّوا ثَلَاثِينَ

اللَّهُ عَلَيه وَسَلَّم قال إذا رأيتموه يعني هلال رمضان فصوموا وإذا رأيتموه يعني هلال شوال فأفطروا

اللَّهُ عَلَيه وَسَلَّم قال إذا رأيتم الهلال فصوموا وإذا رأيتموه فأفطروا فإن غم عليكم فصوموا ثلاثين يوما

‘When you see the new crescent, fast, and when you see it, stop fasting. If it is cloudy then calculate it (as thirty days).” Ibn ‘Umar used to fast one day before the new crescent was seen. (Using translation from Ibn Mājah 1654)

"إِذَا رأيتُمَ الهِلال فَصُوموا، وإذا رَأيتُموهُ فأَفْطِروا، فإِنْ غُمَّ عليكُمْ فاقْدُروا لَه".