Reference for Pesachim 135:1

בועל נדה כטמא מת למאי אילימא לטומאתם האי טומאת שבעה כתיב ביה והאי טומאת שבעה כתיב ביה

<br> He who has intercourse with a niddah is like he who is unclean by the dead. In respect of what: shall we say, in respect of their uncleanness, - but uncleanness for seven [days] is written in connection with the one, and uncleanness for seven days is written in connection with the other? Hence it must surely be in respect of their camp; and since the second clause is in respect of their camps, the first clause too is in respect of their camps? - What argument is this! the one is as stated, and the other is as stated. <br>

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