What is the meaning of Allaah’s name al-Quddoos?
Question

                What is the meaning of Allaah’s name al-Quddoos (the Holy)?
Praise be to Allah.Al-Quddoos 
          (the Holy) is the One Who is Blessed and Pure, who is exalted above 
          all impurity. It was said that the angels sanctify Him and He, may He 
          be exalted, is the One Who is praised for His virtues and goodness. 
          
 Allaah 
          is al-Quddoos because He is far above having any opposites, rivals, 
          partner or son. He is described as being perfect, and is far above having 
          any faults or shortcomings at all. He is far above anything being near 
          Him or like Him in any aspect of His perfection. Ibn Jareer said: 
“Taqdees 
          (sanctification) is purification and veneration… Quddoos…  purity 
          and veneration are for Him, hence land may be described as ard 
          muqaddasah or holy land, meaning that it is pure. When the 
          angels say ‘Nuqaddisu laka 
          (we sanctify You)’ it means we attribute to You Your attributes of being 
          pure and free of all impurities and of all that the people of kufr attribute 
          to You. It was said that the angels’ sanctification of their Lord is 
          their prayer (salaah). Then he mentioned some of the comments of the 
          mufassireen, who said that taqdees 
          (sanctification) may mean prayer, veneration, glorification, magnification 
          or obedience. Salaah and veneration come back to purification because 
          they declare Him to be pure and free from all that the people of kufr 
          attribute to Him. 
 Ibn 
          al-Qayyim said: 
One of His attributes is the Holy, declaring Him to be above all imperfection and glorifying the Most Merciful