Muwatta Malik 421
موطأ مالك#421Da'ifYahya related to me from Malik that Yahya ibn Said said, "I have heard that the first of the actions of a slave to be considered on the day of rising is the prayer. If it is accepted from him, the rest of his actions will be considered, and if it is not accepted from him, none of his actions will be considered
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMaqtu Daif
In-book reference: 9:96