The document outlines four categories that can nullify one's faith (iman) in God (Allah). The categories are: 1) denial of God's oneness, which has four kinds; 2) denial of worshipping only Allah, which has five kinds; 3) denial of Allah's names and attributes, which has three kinds; and 4) denial of the prophets, which has eight kinds. Some examples provided include atheism, idol worship, denying Muhammad as a prophet, and claiming prophets after Muhammad. The document warns that any of these categories can undermine or nullify one's faith in God.