a. In daf עב in מסכת פסחים the גמרא discusses if one brought a קרבן פסח שלא לשמו, for the sake of another קרבן, did he actually think the animal was another קרבן, or did he try to bring a פסח as a different קרבן? b. The daf concludes the application of טועה בדבר מצווה such as eating נותר , or sleeping with ones wife when she is a נדה . Key terms and concepts: 1. עקירה בטעות - Is when a person uproots the status of a קרבן by mistake there is a question whether the status is effectively changed in such cases. 2. נתנה שבת לידחות - We are more lenient with a person, when he mistakenly violates שבת, when there was a מצווה to override that שבת. 3. נתר - Is meat of a קרבן that is left over the set amount of time to eat a קרבן. 4. בן גרושה ובן חלוצה - A כהן is forbidden to marry a divorcee, or a women who had done חליצה. There child is a חלל, and loses their status as a כהן.