Brochas Daf Chof Daled amud beis

Rav Assi said "Woe to those who pull sin upon themselves with cords of 'shav' falsehood."

Rashi translates 'shav' as weak; Tosfos as gratuitous.

Ritva writes that the majority of mankind sins in order to give themselves pleasure. And this person sins gratuitously because while he performs the mitzva of Krias Shema, he simultaneously degrades the Torah by praying in an inappropriate environment, thereby pulling the sin upon himself for no good reason.