Penalty for Not Carrying Iqama
According to the General Directorate of Passports (Jawazat) SR 3000 or six weeks in prison or together would be fined for non-carrying Iqama (Residence Permit).
This applies even if caught for the first time: Check the Iqama Expiry date
It is always advisable to carry the original Iqama card while traveling within the Kingdom.