‘Abdallah b. Mas'ud said he never saw God’s messenger observe a prayer out of its proper time with the exception of two, the sunset and the evening prayer, which he combined, and the dawn prayer which he observed that day(i.e. al-Muzdalifa) before its proper time.
Ibn ‘Umar said that the Prophet combined the sunset and the evening prayer, each with an iqama, but did not say ‘Glory be to God’ between them, or at the end of each one of them.
Usama b. Zaid rode behind the Prophet on his camel from ‘Arafa to al-Muzdalifa, then he took al-Fadl up behind him from al-Muzdalifa to Mina, and both of them said that the Prophet kept raising his voice in the talbiya till he threw pebbles at the jamra of the ‘Aqaba.