While the Christian Scripture states that among the signs that will be displayed by those who believe is that they shall drink poison and it shall not harm them, Islam teaches that this is not a necessary sign of Faith, nevertheless, those individuals with a high degree of faith may drink poison as a demonstration of the veracity of our Religion and the truth of the Prophet Muhammad صلى الله عليه وآله وسلم
So it is mentioned in our books of history and Hadith that one of the great companions of the Prophet, a man named Khalid bin Walid رضى الله عنه, whom the Prophet named "Sword of God", drank some poison for this purpose. Before he drank it, he made this supplication:
بسم الله وبالله رب الأرض ورب السماء الذي لا يضر مع اسمه داء
"In the Name of Allah, and by Allah, Lord of Earth and Lord of Heaven, in Whose Name no deadly thing or illness can cause harm"
And miraculously he was not harmed.
So while Christians may debate on the scripture in Mark, whether or not it is genuine, and they may debate on the subject of cessationism, whether the gifts of the Holy Spirit like prophesy and speaking in tongues continue after the apostolic age, our Religion rejects cessationism, and our Shaykh, Asrar Rashid, revived the practice of Khalid bin Walid.