A Muslim student I knew in San Francisco found that aspect of the Islamic prayer disturbing. “Why do we have to pray so close together, in such close proximity to each other? Here I am, trying to concentrate all my attention on God, and yet I am constantly conscious of someone’s body brushing against me on my right and left!”
I told him that I thought he had arrived at an important observation that uncovers a fundamental precept of Islam: even in your most intense worship, you are not to forget your brother or sister on your right and on your left. In other words, your personal and spiritual welfare and salvation is inseparably linked to your response to your fellow human beings.
Jeffrey Lang, Struggling to Surrender (page 126-127)