"Be moderate in bowing and prostration, and do not rest your forearms along the ground like a dog." (Using translation from Nasāʾī 1028)
عَنْ رَسُولِ اللهِ ﷺ قَالَ «اعْتَدِلُوا فِي الرُّكُوعِ وَالسُّجُودِ وَلَا يَبْسُطُ أَحَدُكُمْ ذِرَاعَيْهِ كَالْكَلْبِ»