The Prophet ﷺ said, "Maintain proper balance in prostration, and let none of you spread his forearms on the ground like a dog spreading its paws."
حدثنا مسلم بن إبراهيم حدثنا شعبة عن قتادة
أن النبي ﷺ قال اعتدلوا في السجود ولا يفترش أحدكم ذراعيه افتراش الكلب
Reference Bukhari, adhan, chapter: "One should not spread out his forearms in sujud," no. 822, and Muslim, prayer, chapter: "Moderation in sujud and placing the palms on the ground, etc.," no. 493, from the hadith of Shubah, through the same chain.