Musannaf Ibn Abi Shayba 28:689

33217. Abd al-Rahim ibn Sulayman narrated to us, from Muhammad ibn Ishaq, from al-Zuhri and Muhammad ibn Ali, from Yazid ibn Hurmuz, who said: Najdah wrote to Ibn Abbas asking him about women: Did they used to attend war with the Messenger of Allah, may Allah bless him and grant him peace, and was a share [of the spoils] allotted to them? Yazid said: I wrote the letter of Ibn Abbas with my own hand to Najdah. I wrote: You ask me about women: Did they used to attend war with the Messenger of Allah, may Allah bless him and grant him peace, and was a share allotted to them? They did indeed attend with the Messenger of Allah, may Allah bless him and grant him peace. As for a share being allotted to them, no; but he used to give them a gift (radkh).