Asim al-Ahwal عاصم الأحول · The Book of Clothes and Adornment

'Umar wrote to us when we were in Adharba'ijan saying: 'Utba b. Farqad, this wealth is neither the result of your own labour nor the result of the labour of your father, nor the result of the labour of your mother, so feed Muslims at their own places as you feed (members of your family and yourselves at your own residence), and beware of the life of pleasure, and the dress of the polytheists and wearing of silk garments, for…