Sunan an Nasai
1227
Sahih+2

It was narrated from Abu Hurairah that:The Messenger of Allah (ﷺ) prayed Zuhr with two rak'ahs, then said the salam. They said: "Has the prayer been shortened?" So he stood up and prayed two rak'ahs, then he said the salam, then he prostrated twice

SahihAbu Ghuddah
SahihAl-Albani