The concept of unintentional sin relates to the Old Testament. Acts committed against commandments without the intention to do so deliberately were required to be atoned for with sacrifice. Unintentional sins included a range of acts which breached religious prohibitions. It should be noted that unintentional sins were forgivable under religious practices, but the deliberate sins were not. The distinctions were similar to the distinction made between cardinal sins and mortal sins. Specific rituals and atonement practices were required to absolve from unintentional sins.
Examples of Unintentional Sin:
Various factions, physical and moral, constituted unintentional sins:Touching a carcass
Acting improperly as a witness