Sunan Ibn Majah, Hadith 892 ⓘ
It was narrated from Anas bin Malik that the Prophet said: “Be balanced in prostration; none of you should prostrate with his arms spread out like a dog.”
حَدَّثَنَا نَصْرُ بْنُ عَلِيٍّ الْجَهْضَمِيُّ، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ ـ صلى الله عليه وسلم ـ قَالَ " اعْتَدِلُوا فِي السُّجُودِ وَلاَ يَسْجُدْ أَحَدُكُمْ وَهُوَ بَاسِطٌ ذِرَاعَيْهِ كَالْكَلْبِ " .
also referenced under: Book 5, Hadith 942 (In-Book) & Volume 2, Book 5, Hadith 892 (DarusSalam)