عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((بِمَحْلُوفِ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ مَا أَتَى عَلَى الْمُسْلِمِينَ شَهْرٌ خَيْرٌ لَهُمْ مِنْ رَمَضَانَ، وَلَا أَتَى عَلَى الْمُنَافِقِينَ شَهْرٌ شَرٌّ لَهُمْ مِنْ رَمَضَانَ، وَذَلِكَ لِمَا يُعِدُّ الْمُؤْمِنُونَ فِيهِ مِنَ الْقُوَّةِ لِلْعِبَادَةِ، وَمَا يُعِدُّ فِيهِ الْمُنَافِقُونَ مِنْ غَفَلَاتِ النَّاسِ وَعَوْرَاتِهِمْ، هُوَ غَنْمٌ لِلْمُؤْمِنِ يَغْتَنِمُهُ الْفَاجِرُ))
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: By the One by whom the Messenger of Allah, peace and blessings be upon him, swore an oath! There is no month better for the Muslims than the month of Ramadan, and there is no month worse for the hypocrites than this. The reason is that the people of faith prepare strength for worship in this month, while the hypocrite becomes engrossed in seeking out the faults and shortcomings of people during this month. This month is a great opportunity for the believer and also a chance for the wicked.