The Virtue of Ramadan and the Revelation of the Qur'an in it.
Allah praised the month of Ramadan out of the other months by choosing it to send down the Glorious Qur'an, just as He did for all of the Divine Books He revealed to the Prophets. Imam Ahmad reported Wathilah bin Al-Asqa` that Allah's Messenger said:
«أُنْزِلَتْ صُحُفُ إِبْرَاهِيمَ فِي أَوَّلِ لَيْلَةٍ مِنْ رَمَضَانَ، وَأُنْزِلَتِ التَّوْرَاةُ لِسِتَ مَضَيْنَ مِنْ رَمَضَانَ، وَالْإِنْجِيلُ لِثَلاثَ عَشَرةَ خَلَتْ مِنْ رَمَضَانَ، وَأَنْزَلَ اللهُ الْقُرْآنَ لأَرْبَعٍ وَعِشْرِينَ خَلَتْ مِنْ رَمَضَان»
(The Suhuf (Pages) of Ibrahim were revealed during the first night of Ramadan. The Torah was revealed during the sixth night of Ramadan. The Injil was revealed during the thirteenth night of Ramadan. Allah revealed the Qur'an on the twenty-fourth night of Ramadan.)
[هُدًى لِّلنَّاسِ وَبَيِّنَـتٍ مِّنَ الْهُدَى وَالْفُرْقَانِ]
(...a guidance for mankind and clear proofs for the guidance and the criterion (between right and wrong).)
Here Allah praised the Qur'an, which He revealed as guidance for the hearts of those who believe in it and adhere to its commands. Allah said:
(and clear proofs) meaning, as clear and unambiguous signs and unequivocal proof for those who understand them. These proofs testify to the truth of the Qur'an, its guidance, the opposite of misguidance, and how it guides to the straight path, the opposite of the wrong path, and the distinction between the truth and falsehood, and the permissible and the prohibited.