Abu Huraira reported the Messenger of Allah (ﷺ) as saying: When the prayer commences then there is no prayer (valid), but the obligatory prayer. This hadith has been narrated by Warqa' with the same chain of transmitters.

Abu Huraira reported the Messenger of Allah (ﷺ) as saying: When the prayer commences, there is no prayer but the obligatory one.

This hadith has been narrated by Abu Huraira with another chain of transmitters. Hammad (one of the narrators) said: I then met 'Amr (the other narrator) and he narrated it to me, but it was not transmitted directly from the Messenger of Allah (ﷺ).

'Abdullah b. Malik b. Buhaina reported: The Messenger of Allah (ﷺ) happened to pass by a person who was busy in praying while the (Fard of the) dawn prayer had commenced. He said something to him, which we do not know what it was. When we turned back we surrounded him and said: What is it that the Messenger of Allah (ﷺ) said to you? He replied: He (the Holy Prophet) had said to me that he perceived as if one of them was about to observe four (rak'ahs) of the dawn prayer. Qa'nabi reported that 'Abdullah b. Malik b. Buhaina narrated it on the authority of his father. (Abu'l-Husain Muslim said): His assertion that he has narrated this hadith on the authority of his father is not correct.

Ibn Buhaina reported: The dawn prayer had commenced when the Messen- ger of Allah (ﷺ) saw a person observing prayer, whereas the Mu'adhdhin had pronounced the Iqama. Upon this he (the Holy Prophet) remarked: Do you say four (rak'ahs) of Fard in the dawn prayer?

'Abdullah b. Sarjis reported: A person entered the mosque, while the Messenger of Allah (ﷺ) was leading the dawn prayer. He observed two rak'ahs in a corner of the mosque, and then joined the Messenger of Allah (ﷺ) in prayer. When the Messenger of Allah (ﷺ) had pronounced salutations (he had concluded the prayer), he said: O, so and so, which one out of these two prayers did you count (as your Fard prayer), the one that you observed alone or the prayer that you observed with us?

Abu Usaid reported that the Messenger of Allah (ﷺ) said: When any one of you enters the mosque, he should say:" O Allah! open for me the doors of Thy mercy" ; and when he steps out he should say: 'O Allah! I beg of Thee Thy Grace." (Imam Muslim said: I heard Yahya saying: I transcribed this hadith from the compilation of Sulaiman b. Bilal.)

A hadith like this has been narrated from the Messenger of Allah (ﷺ) by Abu Usaid.

Abu Qatada (a Companion of the Prophet) reported Allah's Messenger (ﷺ) as saying: When any one of you enters the mosque, he should observe two rak'ahs (of Nafl prayer) before sitting.

Abu Qatada, a Companion of the Messenger of Allah (ﷺ), said: I entered the mosque, when the Messenger of Allah (ﷺ) had been sitting among people, and I also sat down among them. Upon this the Messenger of Allah (ﷺ) said: What prevented you from offering two rak'ahs (of Nafl prayer) before sitting down? I said: Messenger of Allah, I saw you sitting and people sitting (around you and I, therefore, sat in your company). He (the Holy Prophet) then said: When anyone among you enters the mosque, he should not sit till he has observed two rak'ahs.

Jabir b. 'Abdullah reported: The Messenger of Allah (ﷺ) owed me a debt; he paid me back and made an addition (of this). I entered the mosque and he (the Holy Prophet) said to me: Observe two rak'ahs of prayer.

Jabir b. 'Abdullah reported: The Messenger of Allah (ﷺ) bought a camel from me. When he came back to Medina, he ordered me to come to the mosque and observed two rak'ahs of prayer.

Jabir b. 'Abdullah reported: I went with the Messenger of Allah (ﷺ) on an expedition and my camel delayed me and I was exhausted. The Messenger of Allah (ﷺ) thus came earlier than I, whereas I came on the next day and went to the mosque and found him (the Holy Prophet) at the gate of the mosque. He said: It is now that you have come. I said. Yes. He said: Leave your camel and enter (the mosque) and observe two rak'ahs. He (the narrator) said: So I entered and observed (two rak'ahs) of prayer and then went back.

Ka'b b. Malik reported: The Messenger of Allah (ﷺ) did not come back from the journey but by day in the forenoon, and when he arrived, he went first to the mosque, and having prayed two rak'ahs in it he sat down in it.

'Abdullah b. Shaqiq reported: I asked 'A'isha whether the Messenger of Allah (ﷺ) used to observe the forenoon prayer. She said: No, but when he came back from the journey.

'Abdullah b. Shaqiq reported: I aksed 'A'isha whether the Messenger of Allah (ﷺ) used to observe the forenoon prayer. She said: No, except when he came back from a journey.

'Urwa reported 'A'isha to be sayidg: I have never seen the Messenger of Allah (ﷺ) observing the supererogatory prayer of the forenoon, but I observed it. And if the Messenger of Allah (ﷺ) abandoned any act which he in fact loved to do, it was out of fear that if the people practised it constantly, it might become obligatory for them.

Mu'adha asked 'A'isha (Allah be pleased with her) how many rak'ahs Allah's Messenger (ﷺ) prayed at the forenoon prayer. She replied: Four rak'ahs, but sometimes more as he pleased.

Mua'ada 'Adawiyya reported 'A'isha as saying: The Messenger of Allah (ﷺ) used to observe four rak'ahs in the forenoon prayer and he sometimes observed more as Allah pleased.

Abd al-Rahman b. Abu Laila reported: No one has ever narrated to me that he saw the Messenger of Allah (ﷺ) observing the forenoon prayer, except Umm Hani. She, however, narrated that the Messenger of Allah (ﷺ) entered her house on the day of the Conquest of Mecca and prayed eight rak'ahs (adding): I never saw a shorter prayer than it except that he performed the bowing and prostration completely. But (one of the narrators) Ibn Bashshar in his narration made no mention of the word:" Never".