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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 Ibn Umar:

same as above Hadith 59. [The Book of Knowledge Volume 1, Book 3, Hadeeth 62]