The Synod of Elvira[REF] of around 306 prohibited Christians from marrying, worshipping with, or publicly eating with Jews, pagans and heretics.
The Council of Laodicea of around 365 decreed 59 laws, #29: Christians must not judaize by resting on the Sabbath, but must work on that day, rather honouring the Lord's Day; and, if they can, resting then as Christians.