Here "hand" is a metonym for desiring to do something sinful that you would do with your hand. Alternate translation: "If you want to do something sinful with one of your hands" (See: [[rc://en/ta/man/jit/figs-metonymy]])
Dying and then beginning to live eternally is spoken of as entering into life. Alternate translation: "to enter into eternal life" or "to die and begin to live forever" (See: [[rc://en/ta/man/jit/figs-metaphor]])
missing a body part as a result of having it removed or being injured. Here it refers to missing a hand. Alternate translation: "without a hand" or "missing a hand"