It is narrated from Hazrat Ali bin Hussain (may Allah be pleased with him). He says that the Noble Prophet Muhammad (peace and blessings be upon him) forbade covering the wall with a curtain.

It is narrated from Hazrat Ibn Umar (may Allah be pleased with them both). He says that Hazrat Umar came to know that one of his sons had hung a curtain on his wall. So he said... By Allah! If this is really the case, I will surely burn his house.

It is narrated from Hazrat Salim bin Abdullah. He says that during the lifetime of my father, I held a wedding feast (walima). My father invited many people. Among those invited was Hazrat Abu Ayyub. And I had decorated my room with green curtains. Hazrat Abu Ayyub arrived and my father was standing and watching, seeing that the house was covered with green curtains. Hazrat Abu Ayyub said, "O Abu Abdullah! Do you hang curtains on the walls?" My father replied, and at that moment he felt embarrassed… "O Abu Ayyub! Women have prevailed over us." Hazrat Abu Ayyub said, "If a person fears that women will prevail over him, then I have no fear that they will prevail over you. I will not eat your food, nor will I enter your house." Then he went out.