Ibn Taahir al-Maqdisee al-Haafidh said, I heard the Imaam, Abu Ismaa'eel 'Abdullaah ibn Muhammad al-Ansaaree saying, whilst in Haraah:

((The sword was put to my neck five times [and each time] it was not said to me, 'Leave your madhhab' but it was said to me, 'Remain silent about those who are in opposition to you'. So I would say, 'I will not remain silent')).

Aadaab ash-Sharee'ah (1/207) of Ibn Muflih al-Maqdisee al-Hanbalee

Ref: Fatwa-Online

Shaykh Muhammad ibn Saalih al-Uthaymeen said:

"And because the marriage of mut`ah can lead to the ruin of children who are the product of intercourse in this (type of) marriage, and it can also lead to much mischief and corruption amongst the ummah."

Ref: The prohibition of the marriage of Mut`ah