He who is free from all error, absentmindedness, is free from incapability and from any kind of defect.
“ Whatever is in the heavens and on earth, doth de- clare the Praises and Glory of Allah; the Sovereign, THE HOLY ONE, the Exalted in Might, the Wise”
(62:1) The Holy Quran

From the root q-d-s with the classical Arabic connotations: to be pure, clean, spotless to be far removed from impurity or imperfection to be holy, sacred, hallowed
Allah is pure, spotless, without blemish or fault.
Allah is far from, and untouched by, worldly imperfections or faults.
His essence and attributes are of unimaginable purity and perfection.
He is beyond all human understanding of purity, perfection and holiness.
