Musnad Ahmad 30:239

Sufyan narrated to us, Suhail ibn Abi Salih narrated to us, from his father, from Abu Hurairah: Some women came to the Messenger of Allah, may Allah bless him and grant him peace, and said: "O Messenger of Allah, by Allah, we cannot reach you in your gathering because of the men, so appoint for us a day from yourself on which we may come to you." He said: "Your appointment is the house of so-and-so." He came to them on that day and at that appointment. He said: Among what he said to them was: "There is no woman who sends ahead three of her children, seeking their reward, except that she will enter Paradise." A woman among them said: "Or two?" He said: "Or two."