俱舍論疏 18.35

18.35

論「若於父母至謂餘而殺」，明誤不成逆罪。《婆沙》中云「遣使父母行時殺，若父母坐殺，不成逆罪。如是等但舉本心不同皆不成逆。」

The Śāstra states: "If toward one's father and mother... thinking they are another and killing them", explaining that a mistake does not constitute an anantarya offense. In the Vibhāṣā, it says: "If one dispatches an emissary to kill the parents while they are walking, but they are killed while sitting, it does not constitute an anantarya offense. In such cases, merely bringing forth a discrepancy with the original intention means that none of them constitutes an anantarya."