Narrated `Abdullah bin Malik bin Buhaina: Whenever the Prophet (ﷺ) used to offer prayer he used to keep arms away (from the body) so that the whiteness of his armpits was visible
Book 10 · Hadith 202
صحيح البخاري
Narrated `Abdullah bin Malik bin Buhaina: Whenever the Prophet (ﷺ) used to offer prayer he used to keep arms away (from the body) so that the whiteness of his armpits was visible