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.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ شُعْبَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم
" اعْتَدِلُوا فِي السُّجُودِ وَلاَ يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ انْبِسَاطَ الْكَلْبِ " .
• Sahih Muslim, 493a
• Sahih Muslim, Vol. 1, Book of Prayers, Hadith 997
• Sahih Muslim, Book of Prayers, Hadith 997