Mishkat al-Masabih 3941
Umm ‘Atiya said:
I went on seven expeditions with God's Messenger and stayed behind to look after the baggage, prepare food for them, tend the wounded and look after the sick. 

Muslim transmitted it.
وَعَن أُمِّ عطيَّةَ قَالَتْ: غَزَوْتُ مَعَ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ سَبْعَ غَزَوَاتٍ أَخْلُفُهُمْ فِي رِحَالِهِمْ فَأَصْنَعُ لَهُمُ الطَّعَامَ وَأُدَاوِي الْجَرْحَى وَأَقُومُ عَلَى المرضى. رَوَاهُ مُسلم