Combining two prayers due to some illness or excuse
     Ahmad, Qadi Hussain, al-Khattabi, and al-Mutawali of the    Shaf'i school are of the opinion that it is allowed to    combine two prayers, either during the time of the    earlier or later salah, due to illness as it is a greater    hardship than rain. An-Nawawi says: "This is a strong    opinion based on [sound] evidence." In al-Mughni it is    stated: "The illness which permits one to combine the    prayers is the one which would otherwise cause hardship    and more weakness [if he prayed each salah separately]."
         The Hanbali school is the most accommodating as it allows    one to combine the prayers, at the time of the early or    later salah, for one who is ill as well as for the woman    who is breast-feeding and will face hardship in cleaning    her dress for every salah, for the woman who is plagued    by a prolonged flow of blood, for the person who cannot    control his urine, and for one who cannot purify himself    or herself, and for the one who fears for his life,    property, or family.
         Ibn Taimiyyah says: "Among the opinions the most    accommodating on this question is that of the Hanbali    school which allows one to combine the prayers if he is    busy (since an-Nasa'i has related something to that    effect from the Prophet sallallahu alehi wasallam) and    they also say that the cook and baker, and so forth., may    also combine their prayers if they fear their wealth    (i.e., their investment or what they are working on) will    otherwise be ruined."
    
Combining prayers due to some pressing need
     Imam an-Nawawi writes in his commentary on Sahih Muslim:    "The majority of the scholars are of the opinion that it    is allowed for the resident to combine the prayers due to    some pressing need. This is the statement of Ibn Sireen    and Ashhab from the companions of Malik, and al-Khattabi    records it from al-Qifal and ash-Shaf'i and from Abu    Ishaq al-Maruzi, and from a number of as-hab al-ahadith,    and it is the conclusion of Ibn al-Mundhir. This is    supported by the statement of ibn 'Abbas: 'The Prophet    combined his salah because he did not want to put his    ummah to hardship, and not because of illness or any    other reason."' The hadith from Ibn 'Abbas, mentioned    previously, has been recorded by Imam Muslim who states:    "The Messenger of Allah combined the zuhr and 'asr and    then the maghrib and 'isha in Medinah without there being    any danger or rain." Ibn 'Abbas was asked: "What did he    desire by that action?" He replied: "He did not want any    hardship for his ummah." Al-Bukhari and Muslim record    from him that the Prophet prayed seven rak'at and eight    rak'at, i.e., the zuhr and 'asr together and the maghrib    and 'isha together, in Medinah. Muslim also records from    'Abdullah ibn Shaqiq that 'Abdullah ibn 'Abbas addressed    the people one day after the 'asr salah until well after    the sun had set and the stars began to appear. The people    said to him: "The prayer, the prayer." A man from the    tribe of Taim continuously repeated: "The prayer, the    prayer." Ibn 'Abbas said: "Are you teaching me the    sunnah? May you have no mother." Then he said: "I saw the    Messenger of Allah combine the zuhr and 'asr and the    maghrib and 'isha." 'Abdullah ibn Shaqiq commented: "I    felt some uneasiness in my heart about what he had said,    so I went to Abu Hurairah to ask him about that, and he    confirmed what Ibn 'Abbas had said."
    
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"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
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