We know that we fast on the day of ashura coz that day was the day when Allah saved Musa (PBUH) and his followers.
Ka dib bal aan wax yar ka nidhaahno ninka la filaayo in bari oo ah maalin salaaso ah haduu alleh idmo noqon doono murashaxa xisbiga kulmiye ee doorshada soo socota muuse biixi waan ku hambaleynayaa samirkiisa iyo adkeysigiisa uu halkaasi ku soo gaadhey marka hore.