The Messenger of Allah (ﷺ) said. When you prostrate yourself, place the palms of your hands on the ground and raise your elbows.
Sahih Muslim Book 4, Hadith 266
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Sahih Muslim Book 4, Hadith 265 Next Hadith → When the Prophet (ﷺ) prostrated, lie spread out his arms so that the whiteness of his armpits was visible.

Sahih Muslim Book 4, Hadith 267