Chapter 5: The Book On The Mosques And The Congregations
It was narrated from Abu Sa' eed Al-Khudri that: He heard the Messenger of Allah say: 'Shall I not tell you of something by means of which Allah expiates for sins and increases good deeds?' They said: 'Yes, O Messenger of Allah.' He said: 'Performing ablution properly despite difficulties, increasing the number of steps one takes towards the mosque and waiting for the next prayer after prayer.'
Sunan Ibn Majah 776