It was narrated from Abu Sa'eed 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: "Perform ablution properly despite difficulties, increasing the number of steps one takes towards the mosque and waiting for the next prayer after prayer.'" (IT)
English reference (IT): Vol. 1, Book 1, Hadith 427 (IT)
Arabic reference (IT): Book 1, Hadith 462 (IT)