The Messenger of Allah (ﷺ) said: When any one of you is engaged in prayer, he is holding intimate conversation with his Lord, so none of you must spit in front of him, or towards his right side, but towards his left side under his foot.
Reference: Sahih Muslim 551 In-book : Book 5, Hadith 68 USC-MSA web (English) : Book 4, Hadith 1123 (deprecated)
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