Sayyiduna ‘Umar (radiyallahu’anhu) reports that Rasulullah (sallallahu’alayhi wasallam) said:
‘Anyone who recites the following after wudu, will have all eight doors of Jannah opened for him to enter from whichever of them he wishes:
Ash-hadu al la ilaha illallahu wahdahu la sharika lahu wa ash-hadu anna Muhammadan ‘Abduhu wa Rasuluh
(I bear witness that no-one is worthy of worship but Allah, the One alone, without partner, and I bear witness that Muhammad is His servant and Messenger)
(Sahih Muslim, Hadith: 552)