Amud 45a

תוס' ד"ה מידי

For it is similar to one who betroths his sister - מידי דהוה אמקדש אחותו

Summary:
People (even according to שמואל) are more aware that אין קידושין תופסין באחותו than being aware that a field cannot be sold on יובל.

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תוס' ד"ה דלא

They should not seize and bring - דלא ליגרבו ולייתו

Summary:
Redeeming one’s self or his wife as well as someone who is מופלג בחכמה are exceptions to the concern of לא לגרבו (as well as redeeming during the חורבן).

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