When Zulaikha followed Yusuf to gratify herself and proposed to commit the sin, Yusuf suddenly observed that she had covered something with a piece of cloth.
“What did you do?” he asked her.
“I have covered the face of the idol so that it does not watch me while I commit the sin,” she replied.
Hearing this, Yusuf said, “(If) you exhibit shyness and modesty before a stone that does not see, it is more befitting for me to exhibit shame and modesty before the One, Who sees and Who is aware of what is manifest about me and what is concealed within me.”( Namunah-e-Ma’arif, Volume 4, Page 385; Bahrul Mahajjah (of Ghazzali), Page 94 )