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 ʿUmar), 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.  

أَنَّ بَعْضَ أَزْوَاجِ النَّبِيِّ ﷺ قُلْنَ لِلنَّبِيِّ ﷺ أَيُّنَا أَسْرَعُ بِكَ لُحُوقًا? قَالَ: «أَطْوَلُكُنَّ يَدًا۔» فَأَخَذُوا قَصَبَةً يَذْرَعُونَهَا فَكَانَتْ سَوْدَةُ أَطْوَلَهُنَّ يَدًا۔ فَعَلِمْنَا بَعْدُ أَنَّمَا كَانَتْ طُولَ يَدِهَا الصَّدَقَةُ وَكَانَتْ أَسْرَعَنَا لُحُوقًا بِهِ وَكَانَتْ تُحِبُّ الصَّدَقَةَ  

[Machine] The Prophet's wives gathered around him one day and said, "O Prophet of Allah, which one of us is the fastest in giving charity?" He replied, "The one among you with the longest hand." So we all took a reed and measured our arms. Soodah bint Zam'a proved to have the longest arm among us. She said, "The Prophet ﷺ passed away and I became the fastest in giving charity." Later, we realized that the length of her hand was due to always giving charity. She was a woman who loved to give charity. Affaan said, "Once she vowed to give a reed that we could measure our arms with."  

اجْتَمَعَ أَزْوَاجُ النَّبِيِّ ﷺ عِنْدَهُ ذَاتَ يَوْمٍ فَقُلْنَ يَا نَبِيَّ اللهِ أَيَّتُنَا أَسْرَعُ بِكَ لُحُوقًا؟ فَقَالَ أَطْوَلُكُنَّ يَدًا فَأَخَذْنَا قَصَبًا فَذَرَعْنَاهَا فَكَانَتْ سَوْدَةُ بِنْتُ زَمْعَةَ أَطْوَلَنَا ذِرَاعًا فَقَالَتْ تُوُفِّيَ النَّبِيُّ ﷺ فَكَانَتْ سَوْدَةُ أَسْرَعَنَا بِهِ لُحُوقًا فَعَرَفْنَا بَعْدُ إِنَّمَا كَانَ طُولُ يَدِهَا مِنَ الصَّدَقَةِ وَكَانَتْ امْرَأَةً تُحِبُّ الصَّدَقَةَ وَقَالَ عَفَّانُ مَرَّةً قَصَبَةً نَذْرَعُهَا  

[Machine] The wives of the Prophet ﷺ gathered around him, and not one of them left. One of them said, "O Messenger of Allah, which one of us is the fastest in reaching you?" He replied, "The one with the longest hand." So they started grabbing a stick, trying to reach it. Soudah bint Zam'ah grabbed it, but she died. She used to give a lot in charity, so we thought that when he said the one with the longest hand, he meant in giving charity.  

أَنَّ نِسَاءَ النَّبِيِّ ﷺ اجْتَمَعْنَ عِنْدَهُ لَمْ تُغَادِرْ مِنْهُنَّ وَاحِدَةٌ قَالَتْ فَقُلْتُ يَا رَسُولَ اللَّهِ أَيَّتُنَا أَسْرَعُ بِكَ لُحُوقًا؟ فَقَالَ «أَطْوَلُكُنَّ يَدًا» قَالَ فَأَخَذْنَ قَصَبَةً يَتَذَارَعْنَهَا فَمَاتَتْ سَوْدَةُ بِنْتُ زَمْعَةَ وَكَانَتْ كَثِيرَةَ الصَّدَقَةِ فَظَنَنَّا أَنَّهُ قَالَ أَطْوَلُكُنَّ يَدًا بِالصَّدَقَةِ  

"Which of us will be the first to following you (in death)?" He said: "The one of you who has the longest arms." They took a stick and started to measure their arms. But Sawdah was the first one to follow him. She was the one who had the longest arms, because she used to give in charity a great deal. (Using translation from Nasāʾī 2541)  

أَنَّ أَزْوَاجَ النَّبِيِّ ﷺ اجْتَمَعْنَ عِنْدَهُ فَقُلْنَ أَيُّنَا أَسْرَعُ لُحُوقَا بِكَ؟ قَالَ «أَطْوَلُكُنَّ يَدًا» فَأَخَذْنَ قَصَبَةً فَجَعَلْنَ يَذْرَعْنَهَا وَكَانَتْ سَوْدَةُ أَسْرَعَهُنَّ بِهِ لُحُوقًا وَكَانَتْ أَطْوَلَهُنَّ يَدًا فَكَانَ ذَلِكَ مِنْ كَثْرَةِ الصَّدَقَةِ