From Surah Al-Ma'arij
Allah says,
﴿ إِلَّا ٱلۡمُصَلِّينَ ﴾
(Except those who are devoted to Salah.) meaning, man is described with blameworthy characteristics except for He whom Allah protects, helps and guides to good, making its means easy for him -- and these are those people who perform Salah.
﴿ ٱلَّذِينَ هُمۡ عَلَىٰ صَلَاتِہِمۡ دَآٮِٕمُونَ ﴾
(Those who with their Salah are Da'imun;) It has been said that this means they guard its times and the elements obligatory in it. This has been said by Ibn Mas`ud, Masruq and Ibrahim An-Nakha`i. It has also been said that it means tranquility and humble concentration (in the prayer). This is similar to Allah's statement,
﴿ قَدۡ أَفۡلَحَ ٱلۡمُؤۡمِنُونَ • ٱلَّذِينَ هُمۡ فِى صَلَاتِہِمۡ خَـٰشِعُونَ ﴾
(Successful indeed are the believers. Those who with their Salah are Khashi`un.) (23:1-2) This was said by `Uqbah bin `Amir. From its meanings is the same terminology used to describe standing (still) water (Al-Ma' Ad-Da'im). This proves the obligation of having tranquility in the prayer. For verily, the one who does not have tranquility (stillness of posture) in his bowing and prostrating, then he is not being constant (Da'im) in his prayer. This is because he is not being still in it and he does not remain (in its positions), rather he pecks in it (quickly) like the pecking of the crow. Therefore, he is not successful in performing his prayer. It has also been said that the meaning here refers to those who perform a deed and are constant in its performance and consistent in it. This is like the Hadith that has been recorded in the Sahih on the authority of `A'ishah that the Messenger of Allah said,
« أَحَبُّ الْأَعْمَالِ إِلَى اللهِ أَدْوَمُهَا وَإِنْ قَل »
(The most beloved deeds to Allah are those that are most consistent, even if they are few.) Then Allah says,
﴿ وَٱلَّذِينَ فِىٓ أَمۡوَٲلِهِمۡ حَقٌّ۬ مَّعۡلُومٌ۬ • لِّلسَّآٮِٕلِ وَٱلۡمَحۡرُومِ ﴾
(And those in whose wealth there is a recognized right. For the one who asks, and for the deprived.) meaning, in their wealth is a determined portion for those who are in need. Concerning Allah's statement,
﴿ وَٱلَّذِينَ يُصَدِّقُونَ بِيَوۡمِ ٱلدِّينِ ﴾
(And those who believe in the Day of Recompense.) meaning, they are sure of the Final Return (to Allah), the Reckoning and the Recompense. Therefore, they perform the deeds of one who hopes for the reward and fears the punishment. For this reason Allah says,
﴿ وَٱلَّذِينَ هُم مِّنۡ عَذَابِ رَبِّہِم مُّشۡفِقُونَ ﴾
(And those who fear the torment of their Lord. ) meaning, they are fearful and dreadful.
﴿ إِنَّ عَذَابَ رَبِّہِمۡ غَيۡرُ مَأۡمُونٍ۬ ﴾
(Verily, the torment of their Lord is that before which none can feel secure.) meaning, no one is safe from it (Allah's torment) of those who understand the command from Allah, except by the security of Allah Himself. Then Allah says,
﴿ وَٱلَّذِينَ هُمۡ لِفُرُوجِهِمۡ حَـٰفِظُونَ ﴾
(And those who guard their private part (chastity).) meaning, they keep their private parts away from that which is forbidden and they prevent their private parts from being put into other than what Allah has allowed them to be in. This is why Allah says,
﴿ إِلَّا عَلَىٰٓ أَزۡوَٲجِهِمۡ أَوۡ مَا مَلَكَتۡ أَيۡمَـٰنُہُمۡ ﴾
(Except from their wives or their right hand possessions) meaning, from their female slaves.
﴿ إِلَّا عَلَىٰٓ أَزۡوَٲجِهِمۡ أَوۡ مَا مَلَكَتۡ أَيۡمَـٰنُہُمۡ فَإِنَّہُمۡ غَيۡرُ مَلُومِينَ • فَمَنِ ٱبۡتَغَىٰ وَرَآءَ ذَٲلِكَ فَأُوْلَـٰٓٮِٕكَ هُمُ ٱلۡعَادُونَ ﴾
(for (then) they are not blameworthy. But whosoever seeks beyond that, then it is those who are trespassers.) The explanation of this has already preceded at the beginning of Surat Al-Mu'minun, and therefore does not need to be repeated here. Allah said,
﴿ وَٱلَّذِينَ هُمۡ لِأَمَـٰنَـٰتِہِمۡ وَعَهۡدِهِمۡ رَٲعُونَ ﴾
(And those who keep their trusts and covenants.) meaning, if they are given a trust they do not deceit and when they make a covenant they do not break it. These are the characteristics of the believers which are opposite of the characteristics of the hypocrites. This is like what is reported in the authentic Hadith,
« آيَةُ الْمُنَافِقِ ثَلَاثٌ: إِذَا حَدَّثَ كَذَبَ، وَإِذَا وَعَدَ أَخْلَفَ، وَإِذَا اؤْتُمِنَ خَان »
(The signs of the hypocrites are three. When he speaks he lies, when he promises he breaks his promise, and when he is given a trust he behaves treacherously (with it).) In another narration it states,
« إِذَا حَدَّثَ كَذَبَ، وَإِذَا عَاهَدَ غَدَرَ، وَإِذَا خَاصَمَ فَجَر »
(When he speaks he lies, when he makes a covenant he breaks it, and when he argues he is abusive.) Concerning Allah's statement,
﴿ وَٱلَّذِينَ هُم بِشَہَـٰدَٲتِہِمۡ قَآٮِٕمُونَ ﴾
(And those who stand firm in their testimonies.) This means that they guard their testimonies. They do not add or decrease from what they testify to nor do they conceal their testimonies. Allah says in another Ayah,
﴿ وَمَن يَڪۡتُمۡهَا فَإِنَّهُ ۥۤ ءَاثِمٌ۬ قَلۡبُهُ ۥۗ ﴾
(Who hides it, surely, his heart is sinful.) (2:283) Then Allah says,
﴿ وَٱلَّذِينَ هُمۡ عَلَىٰ صَلَاتِہِمۡ يُحَافِظُونَ ﴾
(And those who are with their Salah, Yuhafidhun.) meaning, they maintain its proper times, its pillars, its obligations and its recommended acts. So Allah begins this discussion (of the believers' attributes) with prayer and He concludes it with prayer. This proves the importance of it and the praise of its noble status, just as what preceded at the beginning of Surat Al-Mu'minun. It is exactly the same discussion. This is why Allah says there (in Al-Mu'minun),
﴿ أُوْلَـٰٓٮِٕكَ هُمُ ٱلۡوَٲرِثُونَ • ٱلَّذِينَ يَرِثُونَ ٱلۡفِرۡدَوۡسَ هُمۡ فِيہَا خَـٰلِدُونَ ﴾
(These are indeed the inheritors. Who shall inherit the Firdaws (Paradise). They shall dwell therein forever.) (23:10-11) And He says here,
﴿ أُوْلَـٰٓٮِٕكَ فِى جَنَّـٰتٍ۬ مُّكۡرَمُونَ ﴾
(Such shall dwell in the Gardens, honored.) meaning, they will be honored with various types of pleasures and delights.
﴿ فَمَالِ ٱلَّذِينَ كَفَرُواْ قِبَلَكَ مُهۡطِعِينَ • عَنِ ٱلۡيَمِينِ وَعَنِ ٱلشِّمَالِ عِزِينَ • أَيَطۡمَعُ ڪُلُّ ٱمۡرِىٍٕ۬ مِّنۡہُمۡ أَن يُدۡخَلَ جَنَّةَ نَعِيمٍ۬ • كَلَّآۖ إِنَّا خَلَقۡنَـٰهُم مِّمَّا يَعۡلَمُونَ ﴾
﴿ فَلَآ أُقۡسِمُ بِرَبِّ ٱلۡمَشَـٰرِقِ وَٱلۡمَغَـٰرِبِ إِنَّا لَقَـٰدِرُونَ • عَلَىٰٓ أَن نُّبَدِّلَ خَيۡرً۬ا مِّنۡهُمۡ وَمَا نَحۡنُ بِمَسۡبُوقِينَ • فَذَرۡهُمۡ يَخُوضُواْ وَيَلۡعَبُواْ حَتَّىٰ يُلَـٰقُواْ يَوۡمَهُمُ ٱلَّذِى يُوعَدُونَ • يَوۡمَ يَخۡرُجُونَ مِنَ ٱلۡأَجۡدَاثِ سِرَاعً۬ا كَأَنَّہُمۡ إِلَىٰ نُصُبٍ۬ يُوفِضُونَ • خَـٰشِعَةً أَبۡصَـٰرُهُمۡ تَرۡهَقُهُمۡ ذِلَّةٌ۬ۚ ذَٲلِكَ ٱلۡيَوۡمُ ٱلَّذِى كَانُواْ يُوعَدُونَ ﴾
(36. So, what is the matter with those disbelievers, before you Muhti`in) (37. On the right and on the left, `Izin.) (38. Does every man of them hope to enter the Paradise of Delight) (39. But no! Verily, We have created them out of that which they know!) (40. But no! I swear by the Lord of the easts and the wests that surely We are Able) (41. To replace them by (others) better than them; and We are not to be outrun.) (42. So, leave them to plunge in vain talk and play about, until they meet their Day which they are promised.) (43. The Day when they will come out of the graves quickly as racing to a Nusub,) (44. With their eyes lowered in fear and humility, ignominy covering them (all over)! That is the Day which they were promised!)