Sabado/Shabbot/sabbath which idolators call saturday. It is a weekly divine appointment with the Creator. Sunday is a day of work as all the other 5 days of the week are, Only this seventh day is blessed and set-apart/sanctified/kodesh/holy in the written Scriptures. The Friday of the Muslims and the first day Sunday of traditions of men Christians is like the Messiah YaHU'SHUA of Nazareth the Son of the living Elohim hanging on the cross between two theives the one in the middle is the one YaHU'SHUA(Called Jesus-Iesus-Iesous through erroneous transliteration) and apostle Sha'ul/Paul kept, Luke 4:16, Acts 13:42-52, Acs 16:12-15, Acts 18:1-4!
Second favorite is payday (every other Friday)