"Allah's Messenger would straighten our lines. One day he came out and saw a man whose chest was protruding from the people, so he said: 'You must straighten your lines, or Allah will cause disagreement to occur among your faces."
Reference: Jami` at-Tirmidhi 227 In-book : Book 2, Hadith 79 English translation : Vol. 1, Book 2, Hadith 227
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