عن عبد الله بن مالك بن بُحَيْنَةَ -رضي الله عنهم-: «أن النبي -صلى الله عليه وسلم- كان إذا صَلَّى فرّج بين يديه، حتى يَبْدُوَ بياضُ إبْطَيْهِ». [صحيح.] - [متفق عليه.] المزيــد ...
‘Abdullāh ibn Mālik ibn Buhaynah (may Allah be pleased with him) reported: When the Prophet (may Allah's peace and blessings be upon him) prayed, he used to keep his upper arms away from his sides, such that the whiteness of his armpits would be visible. Sahih/Authentic. - [Al-Bukhari and Muslim]
When prostrating, and in order to lean on his hands and have them in a straight position, the Prophet (may Allah's peace and blessings be upon him) used to keep his upper arms away from his sides to the extent that the whiteness of his armpits would be visible. He used to do that because he was either leading people in prayer as the Imam or praying alone. As for the one praying behind the Imam, if such a posture would annoy the one praying next to him, then it will not be permissible for him to do that.
Project of Prophetic Hadith Encyclopedia and Its Translations:
An integrated project to choose the Prophetic Hadiths in the Islamic content, explain them in a simplified and adequate way, translate them in a high quality based on accurate procedures into famous languages, then publish them through all available means..
Providing a developed, authentic, free, international reference for the Prophetic hadith translations..
Providing an electronic memory of Hadith translations for translators..
Providing translations in all available means..
Variety of Translations.
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Writing the encyclopedia in Arabic.
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Publishing the encyclopedia online.
Continuous development of the encyclopedia and its translations.