Is it acceptable to slaughter the sacrificial animal in the case of Hajj tamattu‘ on the day of at-Tarwiyah?
Question

                My friend’s parents went to perform the obligatory Hajj in the mid-1990s, and they did tamattu‘ with a group from our country Egypt. Then everyone who was in the group slaughtered the sacrificial animal on the day of at-Tarwiyah and ate from it on the day of at-Tarwiyah and the day of ‘Arafah. They did that on the basis of a fatwa given by the leader of the group, who told them that it came from Shaykh Jaad al-Haqq (may Allah have mercy on him). He also told them that this was how they slaughtered the sacrificial animals every year. Is their offering the sacrifice at that time acceptable, or do they have to offer a compensatory sacrifice? If they have to offer a compensatory sacrifice, do they have to pay the cost themselves when they are in Makkah (as it is possible for them to go for ‘Umrah next year or the following year), or can they appoint someone as their proxy among people they know in Makkah? Please advise us, may Allah reward you.
Praise be to Allah.
    Firstly: 

    The fuqaha’ differed concerning the time 
    when the sacrificial animal is to be slaughtered by those who are doing 
    tamattu‘ (‘Umrah followed by Hajj, exiting ihram in between) and qiraan (‘umrah 
    followed by Hajj, without exiting ihram in between). The majority are of the 
    view that the time for offering the sacrifice begins on the Day of 
    Sacrifice, and it is not valid if done before that. 

    The Shaafa‘is are of the view that it is 
    permissible to sacrifice it after entering ihram for Hajj, or after exiting 
    ihram for ‘Umrah and before entering ihram for Hajj, according to the more 
    correct opinion. 

    Ibn Qudaamah (may Allah have mercy on him) 
    said in al-Mughni (3/247):

    With regard to the time for offering (the 
    sacrifice), it is the Day of Sacrifice. This was the view of Maalik and Abu 
    Haneefah, because before the Day of Sacrifice it is not permissible to 
    slaughter the udhiyah (sacrifice), so by the same token it is not 
    permissible to slaughter the hadiy (sacrificial animal) for Hajj tamattu ‘ 
    during that time, as it is also not permissible before exiting ihram from 
    ‘umrah. Ash-Shaafa‘i said: It is definitely permissible to slaughter it 
    after entering ihram for Hajj. With regard to the time before that, after 
    exiting ihram for ‘umrah, it may or may not be permissible. The reason why 
    it may be permissible is that it is a sacrifice that is connected to ihram, 
    and may be made up for by fasting. Therefore it is permissible to slaughter 
    it before the Day of Sacrifice, like the compensatory sacrifice to be 
    offered if one puts on perfume when in ihram or puts on tailored clothing. 
    Because it is permissible to make it up before the Day of Sacrifice, it is 
    also permissible to slaughter it before that day, like all other fidyahs. 
    End quote. 

    An-Nawawi (may Allah have mercy on him) 
    said: To sum up, there are three scholarly views concerning the time when it 
    is permissible to do it:

    1.
    After entering ihram for ‘umrah

    2.
    After finishing ‘umrah – which is the most correct view

    3.
    After entering ihram for Hajj.

    End quote from al-Majmoo‘ (7/184) 

    The most correct view is that of the 
    majority. 

    Shaykh Ibn ‘Uthaymeen (may Allah have 
    mercy on him) said, when discussing the conditions of the hadiy 
    (sacrifice):…

    4.
    It should be slaughtered at the proper time for 
    slaughtering. Concerning that there is a difference of scholarly opinion, 
    which we may sum up as follows:

    The first view is that the sacrifice of 
    tamattu‘ should not be slaughtered except at the time when the udhiyah 
    sacrifices are also slaughtered, which is the day of ‘Eid and the three days 
    following ‘Eid. 

    The second view is that it is permissible 
    to bring forward the sacrifice after having entered ihram for ‘Umrah. So the 
    hadiy may be slaughtered even before going out to Mina for Hajj, because it 
    is permissible to fast – for the one who does not have a hadiy – before 
    going out for Hajj even though it is making up for the sacrifice. So if that 
    is permissible in the case of making up, then it is more apt to say that it 
    is permissible in the case of the original action. This is the well-known 
    view among the Shaafa‘is. 

    The correct view is that it is stipulated 
    that it should be done at the right time, and that the hadiy in the case of 
    tamattu‘ can only be offered on the days when the sacrificial animals are to 
    be slaughtered, namely the day of ‘Eid and the three days that follow it. 

    The evidence for that is that if it was 
    permissible to bring forward slaughter of the sacrificial animal before the 
    day of Eid, then the Prophet (blessings and peace of Allah be upon him) 
    would have done that, but he said: “I will not exit ihram until I offer the 
    sacrifice.” And that is only permissible on the day of Eid. 
    

    End quote from ash-Sharh al-Mumti‘ 
    (7/91). 

    Secondly: 

    If the pilgrim relied on a fatwa that 
    permitted slaughtering the sacrificial animal on the day of at-Tarwiyah, 
    then his sacrifice is acceptable and he does not have to do anything 
    further. If a person has to offer a compensatory sacrifice, he may appoint a 
    proxy to slaughter it on his behalf in Makkah, and he does not have to 
    slaughter it himself or send the cost to Makkah. 

    To sum up: your friend’s parents do not 
    have to do anything further, and their sacrifice is acceptable, in sha 
    Allah. 

    And Allah knows best.