The Messenger of Allah (ﷺ) said: When a man stands with the intention of saying prayer, or if any of you says prayer, he should not spit before him, nor at his right side; but he should do so at his left side, if there is a place for it; or he should spit under his left foot and then rub it off.
Reference: Sunan Abi Dawud 478 In-book : Book 2, Hadith 88 English translation : Book 2, Hadith 478
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