Musannaf Ibn Abi Shayba 28:348

Muhammad ibn Bakr narrated to us, from Ibn Jurayj, from Abu al-Huwayrith, that Umar allotted seven thousand for al-Abbas, and ten thousand for Aisha and Hafsa, and eight thousand each for Umm Salama, Umm Habiba, Maymuna, and Sawda. He allotted six thousand each for Juwayriya and Safiyya, and he allotted for Safiyya bint Abd al-Muttalib half of what he allotted for them. Umm Salama and her companions sent word to Uthman ibn Affan and said to him, "Speak to Umar regarding us, for he has favored Aisha and Hafsa over us." Uthman came to Umar and said, "Your mothers say to you: 'Make us equal; do not favor some of us over others.'" He said, "If I live until the coming year, I will increase them by two thousand each." When the coming year arrived, he placed Aisha and Hafsa at twelve thousand each, and he placed Umm Salama and Umm Habiba at ten thousand each, and he placed Safiyya and Juwayriya at eight thousand each. When they saw that, they remained silent regarding him.