"the Messenger of Allah said: 'Fast when you see it and stop fasting when you see it, and if it is obscured from you (too cloudy), then count it as thirty (days). "' (Using translation from Nasāʾī 2117)  

قَالَ رَسُولُ اللهِ ﷺ «صُومُوا لِرُؤْيَتِهِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنَّ غُمَّ عَلَيْكُمُ الشَّهْرُ فَعُدُّوا ثَلَاثِينَ»  

: "The Messenger of Allah said: 'Fast when you see it and stop fasting when you see it, and if it is obscured from you (too cloudy), then count it as thirty (days).'" (Using translation from Nasāʾī 2118)  

قَالَ رَسُولُ اللهِ ﷺ «صُومُوا لِرُؤْيَةِ الْهِلَالِ وَأَفْطِرُوا لِرُؤْيَتِهِ فَإِنْ غُمَّ عَلَيْكُمْ فَاقْدُرُوا ثَلَاثِينَ»