The Prophet (ﷺ) said: Stand close together in your rows, bring them near one another, and stand neck to neck, for by Him in Whose hand my soul is, I see the devil coming in through openings in the row just like a small black sheep.
Reference: Sunan Abi Dawud 667 In-book : Book 2, Hadith 277 English translation : Book 2, Hadith 667
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