Sahih al-Bukhari 822
Book 10: Call to Prayers (Adhaan) · Narrated by Anas bin Malik
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، قَالَ حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " اعْتَدِلُوا فِي السُّجُودِ، وَلاَ يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ انْبِسَاطَ الْكَلْبِ ".
English translation
Narrated Anas bin Malik:The Prophet (ﷺ) said, "Be straight in the prostrations and none of you should put his forearms on the ground (in the prostration) like a dog
Reference: Sahih al-Bukhari 822, Book of Call to Prayers (Adhaan). English translation by Dr. Muhammad Muhsin Khan.