Sunan Ibn Majah, Chapter: The Chapters on Marriage

"Umar bin Khattab said: 'Do not go to extremes with regard to the dowries of women, for it that were a sign of honor and dignity in this world or a sign of Taqwa before Allah, then Muhammas would have done that before you. But he did not give any of his wives and none of his daughters were given more than twelve uqiyyah. A man may increase dowry until he feels resentment against her and says: "You cost me everything I own," or , "You caused me a great deal of hardship. " ' "(Hassan)