Muwatta Malik 777
موطأ مالك#777SahihYahya related to me from Malik, from Nafi, that Abdullah ibn Umar used to say, "Someone in ihram should not be cupped, except when there is no other alternative." Malik said, "Someone who is in ihram should not be cupped except when it is necessary
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Sahih
In-book reference: 20:73