It is narrated from Sayyiduna Abu Ayyub Ansari (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) combined the Maghrib and Isha prayers at Muzdalifah.
It is narrated from Sayyiduna Abdullah bin Umar that the Noble Prophet (peace and blessings be upon him) combined the Maghrib and Isha prayers at Muzdalifah, performing three rak'ahs of Maghrib and two rak'ahs of Isha with a single iqamah.
Abdullah bin Malik says: I performed prayer with Sayyiduna Ibn Umar (may Allah be pleased with him) at Muzdalifah; he performed three rak'ahs of Maghrib and two rak'ahs of Isha with a single iqamah. When Khalid bin Malik asked him about this, he said: The Messenger of Allah (peace and blessings be upon him) did the same at this place.
It is narrated from Saeed bin Jubair, he says: We were with Sayyiduna Abdullah bin Umar (may Allah be pleased with them), when he reached Muzdalifah from Arafat, he led the Maghrib prayer and without any interval immediately said, "Let us perform the (Isha) prayer," then he led two rak'ahs, and then said: "Just as I have done, the Messenger of Allah (peace and blessings be upon him) did the same at this place."
Abdur Rahman bin Yazid says: I was with Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him) at Muzdalifah when he performed both prayers with separate adhan and iqamah, and ate food between the two. Then, when dawn broke, he performed the Fajr prayer and after that said: The Messenger of Allah (peace and blessings be upon him) said: These two prayers (Maghrib and Fajr) are performed at this place at times different from the usual. When people reach Muzdalifah, it is quite late (so Maghrib is performed late), and the Fajr prayer is performed at this time.
It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him), he says: I saw the Messenger of Allah (peace and blessings be upon him) that he always performed every prayer at its prescribed time, except for these two prayers (Maghrib and Fajr), that he (by delaying the Maghrib prayer) would perform Maghrib and Isha prayers together at Muzdalifah, and on the next day, he would offer the Fajr prayer earlier than its usual time.
Abdur Rahman bin Yazid narrates, while describing the story of the Hajj he performed with Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him): Sayyiduna Abdullah bin Mas’ud (may Allah be pleased with him) led us in the Maghrib prayer at Muzdalifah. After that, he called for the evening meal, ate it, then performed the ‘Isha prayer, and then went to sleep. When the true dawn had just appeared, he got up and performed the Fajr prayer. I said: You do not usually perform the Fajr prayer this early? He used to perform the Fajr prayer after it had become light. He replied: I saw the Messenger of Allah (peace and blessings be upon him) perform the prayer at this place and on this day at this very time.
It is narrated from Sayyiduna Usama bin Zaid (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) combined the Maghrib and Isha prayers at Muzdalifah and did not perform any voluntary prayer between them.