Narrated 'Umar (May Allah be pleased with him) :
Allah's Messenger (Peace and Blessings of Allah be upon him) said,
"If one after performing ablution (Wudu) completely
recites the following supplication:
(Ash-hadu an la ilaha ill-Allahu wahdahu la sharika lahu,
wa ash-hadu anna Muhammadan 'abduhu wa Rasuluhu)
'I testifity that there is no one worthy of worship but Allah, He is Alone
and has no partner and Muhammad (sallallahu alayhe wa salam) is His
slave and Messenger,'
all the eight gates of Paradise will be opened for him
and he may enter through any gate he wishes. "
(Reported by Muslim)
