Reference: Siyar A’laam an-Nubalaa v9 p98
said:
That day, Ghundar brought out a sack of books, and said: ‘Do your best to find an error in them.’
So we [strived hard, and] did not find an error in any of them.
And [as for Ghundar], he [was a man who] would fast every other day, [and had been doing so] for the past 50 years.
