Narrated Muhammad:
We were with Abu Huraira while he was wearing two linen garments dyed with red clay. He cleaned his nose with his garment, saying, "Bravo! Bravo! Abu Huraira is cleaning his nose with linen! There...
Verily! In the creation of the heavens and the earth, and in the alternation of night and day, there are indeed Signs for men of understanding. Those who remember Allah standing, sitting and lying down on their sides,...
-> Read More Info: Qur'an Aal-'Imran 3: 190-200; Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 8/237; Muslim 1/530.