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"It is made lawful for you to have sexual relations with your wives on the night of As-Sawm (the fasts), They are Libas [i.e, body cover, or screen, or Sakan, (i.e, you enjoy the pleasure of living with her - as in Verse 7:189)], for you and you are the same for them, Allaah knows that you used to deceive yourselves, so He turned to you (accepted your repentance) and forgave you, So now have sexual relations with them and seek that which Allaah has ordained for you (offspring), and eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night), then complete your Sawm (fast) till the nightfall, And do not have sexual relations with them (your wives) while you are in I'tikaf (i.e, confining oneself in a mosque for prayers and invocations leaving the worldly activities) in the mosques, These are the limits (set) by Allaah, so approach them not, Thus does Allaah make clear His Ayaat (proofs, evidences, lessons, signs, revelations, verses, laws, legal and illegal things, Allaah's set limits, orders, etc.) to mankind that they may become Al-Muttaqoon (the pious - see (2):2)." [Al-Baqarah (2):187]

Narrated Abu Jamra:

I was an interpreter between the people and Ibn 'Abbas. Once Ibn 'Abbas said that a delegation of the tribe of'Abdul Qais came to the Prophet who asked them, "Who are the people (i.e. you)? (Or) who are the delegates?" They replied, "We are from the tribe of Rabi'a." Then the Prophet said to them, "Welcome, O people (or said, "O delegation (of 'Abdul Qais).") Neither will you have disgrace nor will you regret." They said, "We have come to you from a distant place and there is the tribe of the infidels of Mudar intervening between you and us and we cannot come to you except in the sacred month. So please order us to do something good (religious deeds) and that we may also inform our people whom we have left behind (at home) and that we may enter Paradise (by acting on them.)" The Prophet ordered them to do four things, and forbade them from four things. He ordered them to believe in Allah Alone, the Honorable the Majestic and said to them, "Do you know what is meant by believing in Allah Alone?" They replied, "Allah and His Apostle know better." Thereupon the Prophet said, "(That means to testify that none has the right to be worshipped but Allah and that Muhammad is His Apostle, to offer prayers perfectly, to pay Zakat, to observe fasts during the month of Ramadan, (and) to pay Al-Khumus (one fifth of the booty to be given in Allah's cause)." Then he forbade them four things, namely Ad-Dubba.' Hantam, Muzaffat (and) An-Naqir or Muqaiyar(These were the names of pots in which alcoholic drinks used to be prepared). The Prophet further said, "Memorize them (these instructions) and tell them to the people whom you have left behind." [The Book of Knowledge Volume 1, Book 3, Hadeeth 87]