Does the hand of a Muslim become impure (mutanajjis) if it touches the wet hand of a Christian or a Hindu?
The hand of a Muslim does not become impure if it touches the hand of someone from the people of the book (i.e., Jews, Christians, Zoroastrians) unless the Muslim knows, even if previously, that their hand has acquired some impurity that can be transferred. As for anyone other than the people of the book (e.g., Hindus, Sikh, others), touching their hands with wetness causes a Muslims hand to become impure (mutanajjis) based on obligatory precaution.