Volume 2, Book 26, Number 742:
Narrated Abdullah (radiallaahu `anhu):
I never saw the Prophet (sallallaahu `alayhi wasallam) offering any prayer not at its stated time except two; he prayed the Maghrib and the 'Isha' together and he offered the morning prayer before its usual time.
Volume 2, Book 26, Number 743:
Narrated 'Abdur-Rahman bin Yazid
I went out with 'Abdullah (radiallaahu `anhu), to Mecca and when we proceeded to am' he offered the two prayers (the Maghrib and the 'Isha') together, making the Adhan and Iqama separately for each prayer. He took his supper in between the two prayers. He offered the Fajr prayer as soon as the day dawned. Some people said, "The day had dawned (at the time of the prayer)," and others said, "The day had not dawned." 'Abdullah (radiallaahu `anhu) then said, "Allah's Apostle (sallallaahu `alayhi wasallam) said, 'These two prayers have been shifted from their stated times at this place only (at Al-Muzdalifa); first: The Maghrib and the 'Isha'. So the people should not arrive at Al-Muzdalifa till the time of the 'Isha' prayer has become due. The second prayer is the morning prayer which is offered at this hour.' " Then 'Abdullah (radiallaahu `anhu) stayed there till it became a bit brighter. He then said, "If the chief of the believers hastened onwards to Mina just now, then he had indeed followed the Sunna." I do not know which proceeded the other, his ('Abdullah (radiallaahu `anhu)'s) statement or the departure of 'Uthman (radiallaahu `anhu). Abdullah (radiallaahu `anhu) was reciting Talbiya till he threw pebbles at the Jamrat-al-'Aqaba on the Day of Nahr (slaughtering) (that is the 10th of Dhul-Hijja).
Volume 2, Book 26, Number 744:
Narrated 'Amr bin Maimun:
I saw 'Umar (radiallaahu `anhu), offering the Fajr (morning) prayer at Jam'; then he got up and said, "The pagans did not use to depart (from Jam') till the sun had risen, and they used to say, 'Let the sun shine on Thabir (a mountain).' But the Prophet (sallallaahu `alayhi wasallam) contradicted them and departed from Jam' before sunrise."
- Combine Maghrib and `Ishaa' with one adhaan and two iqaamahs.
- Pray Fajr early.
Some pilgrims pray Fajr before its time, praying and leaving. This is a serious mistake, because prayer offered before its time is not accepted, rather it is haraam because it is overstepping the limits set by Allaah. Prayers are to offered at set times, the beginning and end of which are defined in sharee’ah, so it is not permissible for anyone to offer a prayer before its time begins.
The pilgrim has to pay attention to this matter, and not pray Fajr until after he is certain or thinks it most likely that the time for Fajr has begun. It is true that he should hasten to pray Fajr in Muzdalifah, because the Messenger (peace and blessings of Allaah be upon him) did that, but that does not mean that he should pray it before its time begins. The pilgrim should beware of doing that.
Other mistakes made by pilgrims on the way to and in Muzdalifah here.
Taken from: http://ilookilisten.wordpress.com/2013/03/23/prayers-in-muzdalifah-ahadith-1442-1444/