One Mitzva

There is one official Mitzva according to the Sefer Hachinuh in this Parsha -
# 24
Not to go beyond the Techum of ones city on Shabos. Based on 16:29.
Why is this point about Shabos so significant to be first & by itself ?

The Siman for 24 is
Kaan Dirosoi.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com