" اعْتَدِلُوا فِي الرُّكُوعِ وَالسُّجُودِ وَلاَ يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ كَالْكَلْبِ "
It was narrated from Anas that the Messenger of Allah (ﷺ) said: "Be moderate in bowing and prostration, and do not rest your forearms along the ground like a dog."