Allah Almighty says: "There is no sin upon you if you divorce women while you have not touched them nor fixed for them a dowry. But give them provision (in that case): the wealthy according to his means and the one in straitened circumstances according to his means, a provision according to what is customary, an obligation upon the doers of good." [Surah al-Baqarah: 236]
Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says regarding this verse: It is about the man who marries without fixing a dowry, then divorces her before consummation. Allah Almighty has commanded that he give her provision (mut'ah) according to his ease or hardship: if he is wealthy, he should give her a servant or something equivalent; and if he is in hardship, then three garments or something equivalent.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14405