ENOfficial
Ash-Shifa’ daughter of ‘Abdallah told that when she was with Hafsa God’s messenger entered and said: “Why do you not teach this one the invocation for skin eruptions as you taught her writing?” Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَن الشَّفاءِ بنت عبد الله قَالَتْ: دَخَلَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَأَنَا عِنْدَ حَفْصَةَ فَقَالَ: «أَلَا تُعَلِّمِينَ هَذِهِ رُقْيَةَ النَّمْلَةِ كَمَا عَلَّمْتِيهَا الْكِتَابَةَ؟» . رَوَاهُ أَبُو دَاوُد
sunnah.com