This tradition has also been transmitted by Zaid bin Thabit through a different chain of narrators to the same effect. Abu Dawud said: Zaid was imam (in a prayer) and he did not make prostration.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
1405. Commentary: The meaning of Imam Abu Dawood rahimahullah's statement is this: Since Hazrat Zaid radi Allahu anhu was reciting (the Qur'an), he was, in effect, acting as the imam. When the imam omitted the prostration (sajdah), the Prophet sallallahu alayhi wa sallam, being a listener, also omitted it. And Allah knows best. (Awn al-Ma'bood)
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 1405