No, a believer does not need to ask for forgiveness for each sin they commit. The phrase “ask forgiveness” or “ask for forgiveness” is not found in any New Testament letter, and for good reason. Remember that Jesus announced from the cross: “It is finished.” Christians are not being forgiven progressively when we ask for it (after all, what if you forget a sin?). No, Christians are totally forgiven people for all time (Hebrews 10:14).