Sayyiduna Umar (may Allah be pleased with him) said: Beware of giving excessive dowers to women. If this were piety in the sight of Allah or a mark of honour among people, the Messenger of Allah (peace and blessings be upon him) would have been the most deserving of it; yet the Messenger of Allah (peace and blessings be upon him) married his wives and married off his daughters, and the dower was only twelve uqiyah, which comes to four hundred and eighty dirhams. One of them raises his wife's dower so high that resentment remains in his heart, and he says: I have borne hardship for your sake, even the strap of the waterskin.
(b) Ibn Sirin (may Allah have mercy on him) reported twelve and a half uqiyah, which agrees with what Abu Salamah (may Allah have mercy on him) narrates from Sayyidah Aishah (may Allah be pleased with her).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14347