Musnad Ahmad 1153:882

'Affan narrated to us, he said: Abu 'Awanah narrated to us, from Firas, from 'Amir, from Masruq, from 'Aishah, she said: The wives of the Prophet, may Allah bless him and grant him peace, gathered with him one day, and they said: "O Prophet of Allah, which of us will be the quickest to join you?" He said: "The one of you with the longest hand." So we took a reed and measured them, and Sawdah bint Zam'ah had the longest arm. She said: The Prophet, may Allah bless him and grant him peace, passed away, and Sawdah was the quickest of us to join him. We realized afterwards that the length of her hand was only due to charity, for she was a woman who loved charity. 'Affan said once: A reed we measure with.