He does not pray in congregation because of his work
Question

                If a person sometimes does not go to Fajr or Taraweeh prayer because of intense pressure at work, is that permissible or not? Please note that my father usually does not fail to pray Taraweeh in Ramadaan unless he is sick and he is also religiously-committed – praise be to Allaah – but now because of the pressure of work he does not go to pray sometimes.
Praise be to Allah.Prayer in 
    congregation is obligatory at all times, because Allaah says (interpretation 
    of the meaning): 
“When you 
    (O Messenger Muhammad) are among them, and lead them in As‑Salaah (the 
    prayer), let one party of them stand up [in Salaah (prayer)] with you taking 
    their arms with them; when they finish their prostrations, let them take 
    their positions in the rear”
[al-Nisa’ 
    4:102]
Allaah has 
    enjoined prayer in congregation at times of war, so how about at times of 
    peace? 
Al-Bukhaari 
    (608) and Muslim (1040) narrated that the Prophet  (peace and blessings 
    of Allaah be upon him) said: “I was thinking of ordering that firewood be 
    gathered, then I would order that the call to prayer be given, then I would 
    order a man to lead the prayer, then I would go to men who do not attend the 
    prayer and I would burn their houses down around them.” In Saheeh Muslim 
    (1044) it says: A blind man came to the Prophet  (peace and blessings of 
    Allaah be upon him) and said: “O Messenger of Allaah, I do not have a guide 
    to bring me to the mosque.” He asked the Messenger of Allaah  (peace and 
    blessings of Allaah be upon him) to grant him a concession allowing him to 
    pray in his house, and he granted him that concession, but when he turned to 
    leave he said: “Can you hear the call to prayer?” He said: “Yes.” He said: 
    Then answer it.” So the Muslim should regularly pray in congregation at all 
    times, and not let any worldly distractions keep him away from that. 
Allaah says 
    (interpretation of the meaning): 
“O you 
    who believe! Let not your properties or your children divert you from the 
    remembrance of Allaah. And whosoever does that, then they are the losers”

    [al-Munaafiqoon 63:9]
You should 
    advise your father and remind him of this saheeh evidence, with wisdom and 
    beautiful preaching. 
This ruling 
    applies to offering the five daily prayers in congregation. With regard to 
    Taraweeh, the matter is easier than that. It is permissible for a Muslim to 
    pray Taraweeh at home, although it is better to pray it in congregation in 
    the mosque. 
It is not 
    permissible for a Muslim to devote himself to worldly work at the expense of 
    his worship and prayer. Allaah has described the believers as those who do 
    not let their trade and selling distract them from the remembrance of Allaah 
    and establishing prayer. Allaah says (interpretation of the meaning): 
“In 
    houses (mosques) which Allaah has ordered to be raised (to be cleaned, and 
    to be honoured), in them His Name is remembered [i.e. Adhaan, Iqaamah, 
    Salaat (prayers), invocations, recitation of the Qur’aan]. Therein glorify 
    Him (Allaah) in the mornings and in the afternoons or the evenings,
37. Men 
    whom neither trade nor sale (business) diverts from the remembrance of 
    Allaah (with heart and tongue) nor from performing As‑Salaat 
    (Iqaamat‑as‑Salaat) nor from giving the Zakaah. They fear a Day when hearts 
    and eyes will be overturned (out of the horror of the torment of the Day of 
    Resurrection).
38. That 
    Allaah may reward them according to the best of their deeds, and add even 
    more for them out of His Grace. And Allaah provides without measure to whom 
    He wills”
[al-Noor 
    24:36-38]
This passage 
    ends with the words “And Allaah provides without measure to whom He wills”, 
    which hints to the one who spends his time in trade and work at the expense 
    of his obedience to his Lord, that provision is in the hand of Allaah and He 
    provides without measure to whom He wills. The Prophet  (peace and 
    blessings of Allaah be upon him) explained that when he said: “O people, 
    fear Allaah and be moderate in seeking a living, for no soul will die until 
    it has received all its provision, even if it is slow in coming. So fear 
    Allaah and be moderate in seeking provision; take that which is permissible 
    and leave that which is forbidden.” Narrated by Ibn Maajah, 2144, from the 
    hadeeth of Jaabir ibn ‘Abd-Allaah (may Allaah be pleased with him); classed 
    as saheeh by Shaykh al-Albaani in Saheeh al-Targheeb (1698). 
There is no 
    reason why you should not do what you can to earn a living, but the Muslim 
    should not go to extremes with work and devote all his time to it at the 
    expense of his worship, health and raising his children. He should create a 
    balance between everything. 
We hope that 
    your father will study what we have said and think about it properly. We ask 
    Allaah to guide him to the best of words, deeds and attitudes, and to bless 
    him with a goodly and blessed provision. 
And Allaah 
    knows best.