(5) باب السُّجُودِ فِي { ص }
Narrated Ibn 'Abbas:
A prostration when reciting Sad is not one of those which are divinely commanded, but I have seen Messenger of Allah (ﷺ) prostrate himself. (ES)
Reference (ES): Sunan Abi Dawud 1409 (ES)
In-book reference (ES): Book 7, Hadith 9 (ES)
English translation (ES): Book 7, Hadith 1404 (ES)