Al-Matalib al-'Aliyah 3696 — Surah Sad

It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that he said: "Indeed, the Commander of the Believers, Sayyiduna Umar bin al-Khattab (may Allah be pleased with him), performed the prostration of recitation (at the place of prostration) while reciting Surah 'Sad' [Surah Sad: 1]."
The chain of this hadith is sahih, and Musaddad bin Musarhad narrated it in his Musnad.