Hadith on Prayer: Be dignified and upright during prostration, not like a dog

A nas ibn Malik reported: The Prophet, peace and blessings be upon him, said, “Be straight in prostration and let none of you put his forearms on the ground like a dog.”

Source: Sahih Bukhari 788, Sahih Muslim 493

Grade: Mutaffaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Imam Muslim

عَنْ أَنَسِ بْنِ مَالِكٍ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ اعْتَدِلُوا فِي السُّجُودِ وَلَا يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ انْبِسَاطَ الْكَلْبِ

788 صحيح البخاري أَبْوَابُ صِفَةِ الصَّلَاةِ بَاب يَفْتَرِشُ ذِرَاعَيْهِ فِي السُّجُودِ

493 صحيح مسلم كِتَاب الصَّلَاةِ باب الِاعْتِدَالِ فِي السُّجُودِ وَوَضْعِ الْكَفَّيْنِ عَلَى الْأَرْضِ وَرَفْعِ الْمِرْفَقَيْنِ عَنْ الْجَنْبَيْنِ