ar ribat

Messenger of Allah (salallahu alayhi wa sallam) said: Should I not direct you to something by which Allah obliterates the sins and elevates (your) ranks.“ They said: "Yes, O Messenger of Allah”. He said, “Performing Wudu’ properly, even in difficulty, frequently going to the mosque, and waiting eagerly for the next Salat (prayer) after a Salat is over; indeed, that is Ar- Ribat
—  Riyad as-Salihin, The Book of Miscellany, Book 1, Hadith 131