Muwatta Malik 380
موطأ مالك#380SahihYahya related to me from Malik from Hisham ibn Urwa from his father that Abdullah ibn al-Arqam used to lead his companions in prayer. The time for prayer came one day and he went to relieve himself. When he returned, he said, "I heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'If you wish to defecate, you should do so before the prayer
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliSahih
In-book reference: 9:55