Some of the wives of the Prophet (ﷺ) asked him, "Who amongst us will be the first to follow you (i.e. die after you)?" He said, "Whoever has the longest hand." So they started measuring their hands with a stick and Sauda's hand turned out to be the longest. (When Zainab bint Jahsh died first of all in the caliphate of `Umar), we came to know that the long hand was a symbol of practicing charity, so she was the first to follow the Prophet (ﷺ) and she used to love to practice charity. (Sauda died later in the caliphate of Muawiya).
Sahih al-Bukhari Book 24, Hadith 24
← Previous Hadith A man came to the Prophet (ﷺ) and asked, "O Allah's Messenger (ﷺ)! Which charity is the most superior in reward?" He replied, "The charity which you practice while you are healthy, niggardly and afraid of poverty and wish to become wealthy. Do not delay it to the time of approaching death and then say, 'Give so much to such and such, and so much to such and such.' And it has already belonged to such and such (as it is too late)."

Sahih al-Bukhari Book 24, Hadith 23 Next Hadith → Allah's Messenger (ﷺ) (p.b.u.h) said, "A man said that he would give something in charity. He went out with his object of charity and unknowingly gave it to a thief. Next morning the people said that he had given his object of charity to a thief. (On hearing that) he said, "O Allah! All the praises are for you. I will give alms again." And so he again went out with his alms and (unknowingly) gave it to an adulteress. Next morning the people said that he had given his alms to an adulteress last night. The man said, "O Allah! All the praises are for you. (I gave my alms) to an adulteress. I will give alms again." So he went out with his alms again and (unknowingly) gave it to a rich person. (The people) next morning said that he had given his alms to a wealthy person. He said, "O Allah! All the praises are for you. (I had given alms) to a thief, to an adulteress and to a wealthy man." Then someone came and said to him, "The alms which you gave to the thief, might make him abstain from stealing, and that given to the adulteress might make her abstain from illegal sexual intercourse (adultery), and that given to the wealthy man might make him take a lesson from it and spend his wealth which Allah has given him, in Allah's cause."

Sahih al-Bukhari Book 24, Hadith 25