Because in a later section, when speaking of the fourth stage of practice the sūtra says, “Needless to say, anyone who not only keeps this sūtra but also gives alms, observes the precepts, practices patience, makes endeavors, concentrates his mind, and seeks wisdom, will be able to obtain the most excellent and innumerable merits.” This passage from the sūtra makes it clear that people in the first, second, and third stages of practice should refrain giving alms, observing the precepts, and the rest of the first five bodhisattva practices until they arrive at the fourth stage of practice and then they are allowed to begin practicing them. Therefore, if they are only allowed to practice them at this stage, we know that they should refrain from practicing them in the first stage.

Shishin Gohon-shō, The Four Depths of Faith and Five Stages of Practice, Writings of Nichiren Shōnin, Faith and Practice, Volume 4, Page 104