When you prostrate, place your palms and raise your elbows
Chapter: Moderation In Prostration; Placing The Hands On The Ground, Keeping The Elbows Up, Away From The Sides, And Lifting The Belly Up Off The Thighs When Prostrating
The Prophet (may Allah's peace and blessings be upon him) clarified the position of the hands during the prostration in prayer. The palms should be put on the ground with the fingers joined facing the Qiblah (prayer direction), whereas the elbows—the joint between the forearm and the upper arm—should be raised and not touch the ground and should be kept away from the sides.
Lessons
It is obligatory for the one praying to place his palms on the ground, noting that the palms are from the seven body parts included in the prostration.
It is recommended to raise the arms from the ground, and it is disliked to spread them out on the ground like a wild beast.
It is legitimate to display energy, strength, and desire in worship.
When the one praying relies on all of the body parts included in the prostration, each part will receive its due right of worship.
Explanation in Arabic
بَيَّنَ النبيُّ صلى الله عليه وسلم حالةَ اليدين في سجود الصلاة، وذلك بأن يُمَكِّنَ الكفَّين من الأرض ويضعها مضمومة الأصابع في اتجاه القبلة، ويكون المرفقان -مفصل الذراع والعضد- مُرتَفعَين عن ملامسة الأرض ومُفرجين عن الجنبين.
الواجب على المصلِّي أن يَضع كفَّيه على الأرض، والكفان عُضوان من أعضاء السُّجود السَّبعة.
استحباب رفع الذِّراعين عن الأرض، وكراهة افتراشهما كما يَفترش السَّبع ذِراعيه.
مشروعية إظهار النَّشاط والقوَّة والرَّغبة في العَبادة.
المُصلِّي إذا اعتمد على جميع أعضاء السُّجود، أخذ كلُّ عُضوٍ حقَّه من العبادة.