Musannaf Ibn Abi Shayba 9:469

16372. Yazid ibn Harun narrated to us, he said: Ibn 'Awn informed us, from Ibn Sirin, from Abu al-'Ajfa' al-Sulami, who said: Umar said: "Do not exaggerate the dowries of women." Then he mentioned the like of the hadith of Hafs.