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Narrated Aisha(RA): Some of the wives of the Prophet (Peace be upon him) asked him, " Who amongst us will be the first one to follow you (i.e., die after you)?" He said, "The one who has the longest hand."

So they started measuring their hands with a stick and Sauda (RA)'s hand turned out to be the longest. However, when
Zainab (RA) died first, from among all his wives, in the caliphate of Umar (RA), we came to know that the long hand was a symbol of practicing charity. So she was the first to follow the Prophet (Peace be upon him) as she used to love to practice charity. Sauda (RA) died later in the caliphate of Muawiya.

Source: Bukhari Vol. 2, Hadith No. 501