Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Prophet Muhammad (peace and blessings be upon him) said: "Whoever catches one rak'ah of the Fajr prayer before the sun rises, he has caught the prayer, and whoever catches one rak'ah of the Asr prayer before the sun sets, he has caught (the complete) prayer." Imam Abu Bakr (may Allah have mercy on him) says that all the narrators' ahadith have the same meaning, and these words are from the narration of Darawardi. However, Abu Musa has narrated from Muhammad bin Ja'far in his hadith: "Whoever catches two rak'ahs of the Asr prayer (before the sun sets)."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever has prayed one rak'ah in the morning and then the sun rises, he should complete it by praying the second rak'ah with it."

Sayyiduna Imran bin Husain (may Allah be pleased with him) narrates that we were on a journey with the Messenger of Allah (peace and blessings be upon him), and we kept traveling through the night until it was the time of suhoor before dawn. So we lay down to rest, and there is no sleep sweeter for a traveler than at that time (so we slept deeply). Then only the heat of the sun woke us up. The first to wake up was such-and-such person, then such-and-such, Abu Raja used to mention their names, and Awf also used to mention their names, and the fourth was Sayyiduna Umar (may Allah be pleased with him). And when the Messenger of Allah (peace and blessings be upon him) would sleep, we would not wake him until he woke up himself, because we did not know what might be happening to him in his sleep (perhaps some command was being given, etc.). Then when Sayyiduna Umar (may Allah be pleased with him) woke up and saw the people's distress—and he was a man of loud voice, strong and powerful—he began to say "Allahu Akbar" in a loud voice. He kept raising his voice with takbir until the Messenger of Allah (peace and blessings be upon him) woke up from his voice. When he woke up, the companions (may Allah be pleased with them) informed the Messenger of Allah (peace and blessings be upon him) of their distress (that they had missed the prayer). The Prophet (peace and blessings be upon him) said: "There is no harm, or there is nothing to worry about. Move on." So the companions (may Allah be pleased with them) moved on from there. The Prophet (peace and blessings be upon him) traveled a little distance, then dismounted, asked for water, performed ablution, then had the adhan called, and led the people in prayer.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that we camped with the Messenger of Allah (peace and blessings be upon him) for rest during the last part of the night, and we only woke up after the sun had risen. The Messenger of Allah (peace and blessings be upon him) said: "Everyone, take hold of your mount's reins (and set off), for Satan has come to us at this place." (Because our prayer was missed here.) So we complied with the command of the Messenger of Allah (peace and blessings be upon him). (After going some distance) the Prophet (peace and blessings be upon him) asked for water, performed ablution, then prayed two rak‘ahs, then the iqamah was given for the morning prayer.

Sayyiduna Abu Qatadah (may Allah be pleased with him) narrates that when people mentioned negligence due to sleep, he said: "The companions slept until the sun had risen, so the Messenger of Allah (peace and blessings be upon him) said: 'There is no negligence in sleep; indeed, negligence is only in wakefulness. Therefore, if any one of you forgets a prayer or sleeps through it, he should offer it when he remembers it, or on the next day at its time.'"

Abdullah bin Rabah says that when Sayyiduna Imran (may Allah be pleased with him) heard me narrating this hadith, he said: "O young man, narrate the hadith with reflection, for I was present with the Messenger of Allah (peace and blessings be upon him)." But he did not reject anything from this hadith.

It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that when the Messenger of Allah (peace be upon him) and his noble companions missed a prayer due to sleep, the Messenger of Allah (peace be upon him) said: "Perform this prayer tomorrow at its (appointed) time."

Or if he forgets it, then on the next day at its time after making it up upon waking or upon remembering it, this is a matter of virtue, not a matter of strict obligation and requirement, since the Prophet, peace and blessings be upon him, has informed that the expiation for forgetting the prayer or sleeping through it is that the one who slept should pray it when he remembers it, and he has informed that there is no expiation for it except that.

Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) was asked about a person who sleeps through the prayer or forgets it (so what should he do?). The Prophet (peace and blessings be upon him) said: "Its expiation is that when he remembers it, he should perform it."

Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever forgets to perform a prayer or sleeps through it (without performing it), its expiation is that he should offer it as soon as he remembers."

Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever forgets to perform a prayer should offer it when he remembers it; this is its expiation."