Sunan Ibn Majah 281
سنن ابن ماجه#281SahihIt was narrated that Abu Hurairah said:"The Messenger of Allah said: 'When anyone of you performs ablution and does it well, then he comes to the mosque for no other purpose than prayer, he does not take one step but Allah will raise him one degree (in status) thereby, and remove one sin from him thereby, until he enters the mosque
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Fouad Abd al-BaqiSahih
Shuaib Al ArnautHasan Sahih
Zubair Ali ZaiSahih
In-book reference: 1:15