Moderation In Prostration; Placing The Hands On The Ground, Keeping The Elbows Up, Away From The Sides, And Lifting The Belly Up Off The Thighs When Prostrating Sahih Muslim 493 a

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Translation
Anas reported

The Messenger of Allah (ﷺ) said: Observe moderation in prostration, and let none of you stretch out his forearms (on the ground) like a dog.