The prayer at Mina: how many rak'ahs, two or four?

Sayyiduna Imran bin Husayn (may Allah be pleased with him) said: I performed Hajj with the Messenger of Allah (peace and blessings be upon him), and he prayed only two rak'ahs until he returned to Madinah. I performed Hajj with Abu Bakr, and he prayed only two rak'ahs until he returned to Madinah. I performed Hajj several times with Umar, and he prayed only two rak'ahs until he returned to Madinah. Uthman performed Hajj for seven years of his rule, praying only two rak'ahs; then he prayed it as four at Mina.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) prayed two rak'ahs at Mina. Then after him (peace and blessings be upon him) Abu Bakr al-Siddiq prayed two rak'ahs, then after Abu Bakr al-Siddiq Umar prayed two rak'ahs, and Uthman prayed two rak'ahs in the early years of his caliphate. Then Uthman began praying four rak'ahs. When Ibn Umar (may Allah be pleased with them both) prayed with the imam he prayed four rak'ahs, and when he prayed alone he prayed two rak'ahs.

Sayyiduna Harithah bin Wahb (may Allah be pleased with him) said: I prayed two rak'ahs with the Prophet (peace and blessings be upon him) at Mina at a time when the people were the safest and the most numerous they had ever been.

Sayyiduna Anas (may Allah be pleased with him) said: At Mina I prayed two rak'ahs with the Prophet (peace and blessings be upon him), with Abu Bakr al-Siddiq, with Umar, and with Uthman in the early years of his caliphate.

Sayyiduna Abu Juhayfah (may Allah be pleased with him) said: I prayed two rak'ahs with the Prophet (peace and blessings be upon him) at Mina.

Sayyiduna Uthman (may Allah be pleased with him) prayed four rak'ahs at Mina. Sayyiduna Abdullah (bin Mas'ud) (may Allah be pleased with him) said: I prayed two rak'ahs with the Prophet (peace and blessings be upon him) at Mina, and two rak'ahs with the two Shaykhs (Abu Bakr and Umar) as well. Then your paths split and parted, and I wish that, instead of four rak'ahs, I had two accepted rak'ahs.

Al-A'mash said: Mu'awiyah bin Qurrah told me that Sayyiduna Abdullah (may Allah be pleased with him) prayed four rak'ahs after that. It was said to him: "You criticised Uthman, and then you yourself pray four?" Abdullah said: "Disagreement is worse."

Sayyiduna Ibn Umar (may Allah be pleased with them both) prayed two rak'ahs at Mina behind Sayyiduna Ibn al-Zubayr (may Allah be pleased with him). The narrator said: And I saw him pray four behind al-Hajjaj.

Al-Qasim, Tawus and Salim said: Shorten the prayer (qasr) at Mina.

Ata said: The prayers at Mina during the days of Tashriq are two rak'ahs.