Hazrat Moulana Ashraf ‘Ali Thaanwi (rahmatullahi ‘alaihi) mentioned:

On one occasion I reprimanded a servant for carrying a deeni kitaab and his socks both in the same hand and they were touching each other. Hazrat (rahmatullahi ‘alaihi) says that in this day and age basic etiquettes of deen have left the lives of people. Moulana Ahmad Ali Saharanpuri Saheb (rahmatullahi ‘alaihi) writes that students who carry their deeni kitaabs in their left hand and their shoes in their right hand are showing disrespect to the kitaabs of deen, on account of this being contrary to Islamic etiquette. It seems as though they are showing respect and giving preference to their shoes over the deeni kitaabs. (Malfoozaat Hakeemul Ummat 10/ 36)

Source: Ihyaauddeen.co.za