Description of prostration (sujūd):
The Prophet (may Allah bless him and give him peace) would say “Allāhu akbar” and then go down into prostration.
عَنِ ابْنِ عَبَّاسٍ رضي الله عنهما قَالَ:
قَالَ النَّبِيُّ ﷺ: "أُمِرْتُ أَنْ أَسْجُدَ عَلَى سَبْعَةِ أَعْظُمٍ: عَلَى الْجَبْهَةِ" – وَأَشَارَ بِيَدِهِ عَلَى أَنْفِهِ – "وَالْيَدَيْنِ، وَالرُّكْبَتَيْنِ، وَأَطْرَافِ الْقَدَمَيْنِ، وَلَا نَكْفِتَ الثِّيَابَ وَلَا الشَّعَرَ."
Narrated from Ibn ʿAbbās (may Allah be pleased with them both):
The Prophet (may Allah bless him and give him peace) said:
“I have been commanded to prostrate upon seven bones:
upon the forehead” — and he pointed with his hand to his nose — “and upon the two hands, the two knees, and the toes of the two feet; and do not tuck up your clothes or hair.”
(Sahih al-Bukhari, Hadith 812)
The Prophet (may Allah bless him and give him peace) would place both his hands on the ground before his knees when going into prostration.
عَنْ أَنَسِ بْنِ مَالِكٍ رضي الله عنه قَالَ:
قَالَ النَّبِيُّ ﷺ: "اعْتَدِلُوا فِي السُّجُودِ، وَلَا يَبْسُطْ أَحَدُكُمْ ذِرَاعَيْهِ انْبِسَاطَ الْكَلْبِ."
Narrated from Anas ibn Mālik (may Allah be pleased with him): The Prophet (may Allah bless him and give him peace) said:
“Be moderate in your prostration, and let none of you spread his forearms like a dog.”
(Sahih al-Bukhari, Hadith 822)