Muwatta Malik (Yahya)

Hazrat Urwah bin Zubair said: When the morning of the night of Muzdalifah comes (i.e., one has spent the night) and he did not stay in Arafah, then his Hajj is missed. And whoever stayed in Arafah on the night of Muzdalifah before the break of dawn, then he has attained Hajj.

Imam Malik, may Allah have mercy on him, said: If a slave is freed at Arafat, this will not be his obligatory Hajj unless he has not yet assumed Ihram, and if after being freed he assumes Ihram and stays at Arafat before the dawn of the Day of Sacrifice, then his obligatory Hajj will be fulfilled. If he does not assume Ihram until the break of dawn, then his example is like that of someone whose Hajj has lapsed and who did not attain the standing at Arafat until the dawn of the night of Muzdalifah; thus, it will remain obligatory upon this slave to perform the obligatory Hajj.