Allah commands His believing servants to establish prayer, which means worshipping Allah Alone with no partner or associate; to pay the Zakah, which is an act of kindness towards His poor and weak creatures; and by doing so to obey the Messenger of Allah , i.e., to do as he commands them and to avoid what he forbids them, so that Allah will have mercy on them for that. No doubt, whoever does that, Allah will have mercy on him, as Allah says in another Ayah:

﴿أُوْلَـئِكَ سَيَرْحَمُهُمُ اللَّهُ﴾

(Allah will have His mercy on them) ﴿9:71﴾

﴿لاَ تَحْسَبَنَّ﴾

(Consider not) means, `do not think, O Muhammad,' that:

﴿الَّذِينَ كَفَرُواْ﴾

(the disbelievers) meaning, those who opposed and denied you,

﴿مُعْجِزِينَ فِى الاٌّرْضِ﴾

(can escape in the land.) means, that they can flee from Allah. No, Allah is able to deal with them and He will punish them most severely for that. Allah says:

﴿وَمَأْوَاهُمُ﴾

(Their abode) meaning, in the Hereafter,

﴿النَّارُ وَلَبِئْسَ الْمَصِيرُ﴾

(shall be the Fire -- and worst indeed is that destination.) means, how terrible the consequences will be for the disbelievers, how evil a place to stay in and how awful a place to rest!

﴿يأَيُّهَا الَّذِينَ ءَامَنُواْ لِيَسْتَأْذِنكُمُ الَّذِينَ مَلَكَتْ أَيْمَـنُكُمْ وَالَّذِينَ لَمْ يَبْلُغُواْ الْحُلُمَ مِنكُمْ ثَلاَثَ مَرَّاتٍ مِّن قَبْلِ صَـلَوةِ الْفَجْرِ وَحِينَ تَضَعُونَ ثِيَـبَكُمْ مِّنَ الظَّهِيرَةِ وَمِن بَعْدِ صَلَوةِ الْعِشَآءِ ثَلاَثُ عَوْرَاتٍ لَّكُمْ لَيْسَ عَلَيْكُمْ وَلاَ عَلَيْهِمْ جُنَاحٌ بَعْدَهُنَّ طَوَفُونَ عَلَيْكُمْ بَعْضُكُمْ عَلَى بَعْضٍ كَذَلِكَ يُبَيِّنُ اللَّهُ لَكُمُ الاٌّيَـتِ وَاللَّهُ عَلِيمٌ حَكِيمٌ - وَإِذَا بَلَغَ الاٌّطْفَالُ مِنكُمُ الْحُلُمَ فَلْيَسْتَأْذِنُواْ كَمَا اسْتَأْذَنَ الَّذِينَ مِن قَبْلِهِمْ كَذلِكَ يُبَيِّنُ اللَّهُ لَكُمْ ءَايَـتِهِ وَاللَّهُ عَلِيمٌ حَكِيمٌ - وَالْقَوَاعِدُ مِنَ النِّسَآءِ الَّلَـتِى لاَ يَرْجُونَ نِكَاحاً فَلَيْسَ عَلَيْهِنَّ جُنَاحٌ أَن يَضَعْنَ ثِيَابَهُنَّ غَيْرَ مُتَبَرِّجَـتِ بِزِينَةٍ وَأَن يَسْتَعْفِفْنَ خَيْرٌ لَّهُنَّ وَاللَّهُ سَمِيعٌ عِلِيمٌ ﴾

(58. O you who believe! Let your slaves and slave-girls, and those among you who have not come to the age of puberty ask your permission on three occasions: before the Fajr prayer, and while you put off your clothes during the afternoon, and after the `Isha' prayer. (These) three (times) are of privacy for you; other than these times there is no sin on you or on them to move about, attending to each other. Thus Allah makes clear the Ayat to you. And Allah is All-Knowing, All-Wise.) (59. And when the children among you come to puberty, then let them (also) ask for permission, as those senior to them (in age) ask permission. Thus Allah makes clear His Ayat for you. And Allah is All-Knowing, All-Wise.) (60. And the Qawa`id among women who do not hope for marriage, it is no sin on them if they discard their (outer) clothing in such a way as not to show their adornment. But to refrain is better for them. And Allah is All-Hearer, All-Knower.)