Sunan an Nasai
855
Sahih+2

It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said:"Whoever performs wudu' and does it well, then sets out for the Masjid and finds that the people have already prayed, Allah will decree for him a reward like that of those who attended (the prayer), without reducing the slightest from their reward

SahihAbu Ghuddah
SahihAl-Albani