Reference for Berakhot 42:13

ר' יהודה אוסר באנוסת אביו ובמפותת אביו ואמר רב גידל אמר רב מאי טעמא דר' יהודה דכתיב (דברים כג, א) לא יקח איש את אשת אביו ולא יגלה (את) כנף אביו כנף שראה אביו לא יגלה

R. Judah prohibits a man to marry one outraged or seduced by his father. Rab Giddel asked in the name of Rab : What is R. Judah 's reason? Because it is written, "A man shall not take his father's wife and shall not uncover his father's skirt" (Deut. xxiii. 1) — i.e. the skirt which his father had seen shall he not uncover. But how do we know that this refers to one outraged by his father ?

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