It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever has not prayed the two (sunnah) rak'ahs of Fajr until the sun rises, let him pray them (afterwards)." This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.

Sayyiduna Imran bin Husayn (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) was on a journey, and all the people slept through the Fajr prayer until they woke up because of the heat of the sun. Then they moved on a little until the sun had risen high. Then he (peace and blessings be upon him) ordered the mu'adhdhin, and he called the adhan. Then he (peace and blessings be upon him) prayed the two rak'ahs (sunnah) before Fajr. Then the mu'adhdhin called the iqamah, and he (peace and blessings be upon him) led the Fajr prayer. This hadith is sahih (authentic) according to what we have mentioned earlier, that al-Hasan's hearing from Imran is established; however, the two Shaykhs did not record the mention of repeating the sunnah prayers. It has an authentic supporting hadith (shahid) as well:

It is narrated from Qays bin Qahd (may Allah be pleased with him) that he came while the Prophet (peace and blessings be upon him) was leading the Fajr prayer, so he prayed with him. When he (peace and blessings be upon him) gave the salam, he stood up and prayed the two (sunnah) rak'ahs of Fajr. The Prophet (peace and blessings be upon him) said to him: "What are these two rak'ahs?" He replied: I had not prayed them before Fajr. So he (peace and blessings be upon him) remained silent and did not say anything. Qays bin Qahd al-Ansari (may Allah be pleased with him) is a Companion, and the chain reaching him is sahih (authentic) on the condition of the two Shaykhs. Muhammad bin Ibrahim al-Taymi has also narrated it from Qays bin Qahd:

It is narrated from Sayyiduna Qays bin Qahd (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) saw a man praying two rak'ahs after the Fajr prayer. The Messenger of Allah (peace and blessings be upon him) said: "Are you praying the Fajr prayer twice?" The man replied: I had not prayed the two rak'ahs that come before it, so I have prayed them now. The narrator said: So the Messenger of Allah (peace and blessings be upon him) remained silent about him.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) was asked about praying in a boat, and he (peace and blessings be upon him) said: "Pray in the boat standing, unless you fear drowning." This hadith has a sahih (authentic) chain on the condition of Imam Muslim, but they did not record it, and it is a shadh (anomalous) narration.

It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever combines two prayers without any excuse has come to one of the great doors of sins." Hanash bin Qays al-Rahabi is trustworthy (thiqah); Imam Bukhari used Ikrimah as evidence; and this hadith is a foundation on the subject of forbidding the combining of prayers without an excuse; however, the two Shaykhs did not record it.

It is narrated from Sayyidah Aishah (may Allah be pleased with her) that she said: I saw the Messenger of Allah (peace and blessings be upon him) praying cross-legged (mutarabbi'an). This hadith is sahih (authentic) on the condition of the two Shaykhs, but they did not record it. Both of them agreed on the narration of "Humayd from Abdullah bin Shaqiq from Aishah" that the Messenger of Allah (peace and blessings be upon him) used to pray at night with long standing. And in this chain, Humayd is without doubt Humayd al-Tawil.

Sayyidah Aishah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) used to pray at night for long periods standing and for long periods sitting. When he (peace and blessings be upon him) prayed standing, he also bowed (ruku') standing, and when he prayed sitting, he also bowed sitting.

It is narrated from Sayyiduna Anas (may Allah be pleased with him) that he said: In the blessed era of the Messenger of Allah (peace and blessings be upon him), we used to prompt the imams (when they forgot the recitation). Yahya bin Ghaylan and Abdullah bin Bazi' are both trustworthy (thiqah). This hadith is sahih (authentic) and it has supporting narrations (shawahid), but the two Shaykhs did not record it.

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Companions of the Messenger of Allah (peace and blessings be upon him) used to prompt one another in the prayer.