عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا: عَجِبْتُ مِمَّنْ يَتَقَدَّمُ الشَّهْرَ، وَقَدْ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((لَا تَصُومُوا حَتَّى تَرَوْهُ، أَوْ قَالَ: صُومُوا لِرُؤْيَتِهِ))
Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) says: I am astonished at the person who starts fasting before the month begins, while the Messenger of Allah (peace and blessings be upon him) has said: Do not fast until you see the moon.