Hadith 1028

It was narrated from Anas that the Messenger of Allah (SAW) said: "Be moderate in bowing and prostration, and do not rest your forearms along the ground like a dog."

أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ بْنُ الْمُبَارَكِ، عَنْ سَعِيدِ بْنِ أَبِي عَرُوبَةَ، وَحَمَّادِ بْنِ سَلَمَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ اعْتَدِلُوا فِي الرُّكُوعِ وَالسُّجُودِ وَلاَ يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ كَالْكَلْبِ ‏"‏ ‏.‏

Reference: 1110330
In-book reference: Book 11, Hadith 1028
Hadith 1028 - The Book of the Commencement of the Prayer - Sunan an-Nasa'i - Sunnah.com