The sale was done without witnesses and the seller denies it. Is it permissible to add the names of two witnesses to the contract?
Question

                The first party sold a piece of land to the second party and wrote a contract for him, but no one witnessed it. The second party paid a large amount of money (the deposit). Then the first party denied this transaction. The lawyer for the second party said that there have to be two witnesses to the contract in order for it to be possible for the land to be handed over.

Is it permissible for two witnesses to sign this contract or not, even though they were not present when the transaction was done, but they are certain that the sale was completed.
Praise be to Allah.
    If the contract was done 
    without witnesses, as stated, then it is not permissible for anyone to add 
    one or two witnesses to it, because this is lying and false witness. The 
    presence of a witness’s name on the contract means that he was present when 
    it was done and witnessed the proposal and acceptance. If that did not 
    happen, then affirming it now is false witness and lying. The fact that the 
    witnesses are certain that the transaction took place does not make it 
    permissible to add their testimony to a contract at which they were not 
    present. 

    The person who has been 
    wronged has to strive to take his rights in the way prescribed in sharee’ah, 
    without lying or fabricating. 

    What has been narrated 
    concerning giving false witness is no secret. Al-Bukhaari (5976) and Muslim 
    (87) narrated that Abu Bakrah (may Allaah be pleased with him) said: the 
    Messenger of Allaah (blessings and peace of Allaah be upon him) said: “Shall 
    I not tell you of the worst of major sins?” – three times – “Associating 
    others with Allaah, disobeying one’s parents, and bearing false witness – or 
    false speech.” The Messenger of Allaah (blessings and peace of Allaah be 
    upon him) was lying down, then he sat up and kept repeating it until we 
    said: Would that he might fall silent [because they felt compassion for him 
    because of the fervour with which he spoke the words, and they feared that 
    he might exhaust himself]. 

    We ask Allaah to keep us safe 
    and sound.

    And Allaah knows best.