פירוש על במדבר 1:20

בכור ישראל. He had not lost his status in the books kept in heaven as he had repented his sin as testified in Genesis 35,22-23 commencing with the otherwise unnecessary words ויהיו בני יעקב שנים עשר, “that Yaakov’s sons remained twelve.” This was in contrast to Reuven’s birthright privileges here on earth having been revoked in favour of Joseph.

כל יוצא צבא, all who were able to go to war. The Torah repeats this comment every time the number of males in a tribe is given. This is because the Torah wants to tell us that amongst all the males over the age of twenty counted there was not even one who was physically unfit to go to war.