He entered ihram and did not stipulate that he would exit ihram if something prevented him from continuing, then he was prevented from entering Makkah and he went back to his country
Question

                I entered ihram from Dhu’l-Hulayfah and I did not stipulate that I would exit ihram if something prevented me from continuing, then I was prevented by the police because my visa had expired, and I went back to my country. What should I do?.
Praise be to Allah.
    If a person enters ihram for Hajj or ‘Umrah then something 
    prevents him from reaching the Sacred House and completing his pilgrimage, 
    if he had stipulated when entering ihram, “O Allaah, my exiting ihram will 
    be where I am prevented from continuing,” then he will have exited ihram and 
    will not have to do anything, but if he did not make this stipulation and 
    then he is prevented from continuing, he should slaughter a sheep in the 
    place where he was prevented from continuing, whether he was in the 
    sanctuary or not, and he should give it to the poor people in that place or 
    send it to the poor people of the sanctuary, then he should shave his head 
    or cut his hair and exit ihram. 

    Allaah says (interpretation of the meaning):

    “And perform properly (i.e. all the ceremonies according 
    to the ways of Prophet Muhammad صلى الله عليه 
    وسلم), the Hajj and ‘Umrah (i.e. the pilgrimage to Makkah) for 
    Allaah. But if you are prevented (from completing them), sacrifice a Hady 
    (animal, i.e. a sheep, a cow, or a camel) such as you can afford, and do not 
    shave your heads until the Hady reaches the place of sacrifice”

    [al-Baqarah 2:196]. 

    Ibn Qudaamah (may Allaah have mercy upon him) said: The 
    scholars are unanimously agreed that if the pilgrim in ihram is prevented 
    from continuing by an enemy, be it mushrikeen or others, and they prevent 
    him from reaching the Ka’bah and he cannot find a safe route, then he may 
    exit ihram. Allaah has stated that in the verse, “But if you are 
    prevented (from completing them), sacrifice a Hady (animal, i.e. a sheep, a 
    cow, or a camel) such as you can afford”. And it is proven that the 
    Prophet (blessings and peace of Allaah be upon him) ordered his Companions, 
    on the day they were prevented from continuing (the ‘Umrah) at 
    al-Hudaybiyah, to offer their sacrifices, shave their heads and exit ihraam. 
    This applies whether the ihram is for Hajj or ‘Umrah or both, according to 
    the opinion of our imam (Imam Ahmad), Abu Haneefah and al-Shaafa’i. … The 
    one who exits ihram because he has been prevented from continuing has to 
    offer the hadiy (sacrifice) according to the majority of scholars, because 
    Allaah says, “But if you are prevented (from completing them), sacrifice 
    a Hady (animal, i.e. a sheep, a cow, or a camel) such as you can afford.” 
    Al-Shaafa’i said: There is no difference of opinion among the scholars of 
    tafseer concerning the fact that this verse was revealed when they were 
    prevented from continuing their ‘umrah at al-Hudaybiyah. End quote from 
    al-Mughni, 3/172 

    Some scholars are of the view that if the one who is 
    prevented from continuing cannot find a sacrificial animal then he may fast 
    for 10 days, by analogy with the pilgrim who does tamattu’. 

    Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) was of 
    the view that if the one who is prevented from continuing cannot find a 
    sacrificial animal, he does not have to fast, because Allaah did not mention 
    fasting in the verse on being prevented from continuing one's pilgrimage. 

    And because the apparent of the situation of the Companions 
    at the Treaty of al-Hudaybiyah was that they were poor and there is no 
    report that the Prophet (blessings and peace of Allaah be upon him) 
    commanded those who did not have sacrificial animals with them to fast for 
    ten days.  

    See: al-Sharh al-Mumti’, 7/184, 185 

    Based on that, what you have to do now is to delegate someone 
    to offer a sacrifice for you in Makkah to be distributed to the poor of the 
    sanctuary, then shave your head or cut your hair and exit ihram. 

    You have to avoid all the things that are forbidden in ihram 
    until your exiting ihram is complete. 

    Whatever you may have done during this period of things that 
    are forbidden in ihram out of ignorance on your part, you do not have to do 
    anything as a result. 

    If you cannot offer a sacrifice, then you should shave your 
    head or cut your hair, and thus you will have exited ihram. 

    And Allaah knows best.