Muwatta Malik 395
موطأ مالك#395SahihYahya related to me from Malik from Ibn Shihab that Abu Umama ibn Sahl ibn Hunayf said, "Zayd ibn Thabit entered the mosque and found the people in ruku, so he went into ruku and then moved slowly forward until he reached the row
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: 9:70