Sahih Muslim 1465
Sahih Muslim · Book 17: The Book of Suckling · It is permissible for a wife to give her turn to a co-wife
حَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ ، وَعَبْدُ بْنُ حُمَيْدٍ ، جَمِيعًا عَنْ عَبْدِ الرَّزَّاقِ ، عَنِ ابْنِ جُرَيْجٍ ، بِهَذَا الإِسْنَادِ وَزَادَ قَالَ عَطَاءٌ كَانَتْ آخِرَهُنَّ مَوْتًا مَاتَتْ بِالْمَدِينَةِ .
Ibn Juraij narrated a hadith with the same chain of transmitters, and she (Hadrat Maimuna) was the last of them to die at Medina.