Sunan At-Tirmidhi

Abu Hurairah narrated that :Allah's Messenger said: ""Shall I tell you that for which Allah will wipe out your sins, and raise your ranks?"" They said, ""Of course Allah's Messenger!"" He said: ""Performing Wudu well in difficulty, and taking many steps to the Masajid, and waiting for Salat after Salat, That is the Ribat