Ayesha reported,

Some of the wives of the Prophet ﷺ asked him, "Which of us will be the quickest to join you after your death?"He replied, "The one with the longest hand."So they took a reed and began measuring their hands with it, and Sawdah turned out to have the longest hand among them. We later understood that the length of her hand referred to her generosity in giving charity. She was indeed the quickest of us to join him, and she loved giving charity.

Azami 9719

Sahih

عن عائشة

أن بعض أزواج النبي ﷺ قلن للنبي ﷺ: أينا أسرع بك لحوقا؟ قال: أطولكن يدا. فأخذوا قصبة يذرعونها، فكانت سودة أطولهن يدا، فعلمنا بعد أنما كانت طول يدها الصدقة، وكانت أسرعنا لحوقا به، وكانت تحب الصدقة.

الأعظمي 9719صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Biography of the Prophet ﷺ
Chapter
What came true of his prophecies
Section
Quickest of his wives to join him would be the one with the longest arm
Numbering
Jami al-Kamil 9719 (2nd edition)
Azami 9719