The Prophet (ﷺ) said, "Do the prostration properly and do not put your forearms flat with elbows touching the ground like a dog. And if you want to spit, do not spit in front, nor to the right for the person in prayer is speaking in private to his Lord."
Reference: Sahih al-Bukhari 532 In-book : Book 9, Hadith 11 USC-MSA web (English) : Vol. 1, Book 10, Hadith 509 (deprecated)
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