There is Maryada for reading from Sri Guru Granth Sahib ji, pothi, gutka. This maryada must be kept for proper respect of Gurbani. Why not cap? When was the last time a person washed it? NEVER because washing a cap ruins it majority of the time. So many people don't wash their caps. if they do it's after weeks of wearing it. Same cap is used for many other activities and is constantly touched, dropped, full of sweat, etc. It's similar for serving langar in the Gurdwara or anywhere else where the Guru's langar is being provided to the sangat. As a person is fulfilling a duty given to them by the Guru. There is a requirement to follow about dress because this is not your place. It is the place of the Guru. Bowing the head is not enough. Bow with the mind and cover the head with the provided head covers when doing langar di seva.
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