Muwatta Malik 206
موطأ مالك#206SahihYahya related to me from Malik that he asked Ibn Shihab and Nafi, the mawla of Ibn Umar, whether a man who joined an imam who had already done a raka should say the tashahhud with the imam in the second and fourth rakas, even though these were odd for him? They said, "He should say tashahhud with him." Malik said, "That is the position with us
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMaqtu Sahih
In-book reference: 3:39