{ Sahih Al-Bukhari ~ Book #75, Hadith #412 }

Sayyiduna Abu Hurairah (radi Allahu anhu) reported:

The Messenger of Allah (sall'Allahu alaihi wasallam) said,

"Whoever says,

La ilah ill` Allah,
wahdahu la sharika lahu
Lahul mulk wa lahul hamd,
wahua `ala kulli shayin qadeer'

{ There is no true god except Allah.
He is One and He has no partner with Him;
His is the sovereignty and His is the praise,
and He is powerful over everything }

one hundred times will get the same reward
as given for manumitting ten slaves;
and one hundred good deeds
will be written in his accounts,
and one hundred sins will be
deducted from his accounts,
and it will be a shield for him
from Satan on that day till night,
and nobody will be able to do a better deed
except the one who does more than he.

{ Sahih Al-Bukhari ~ Book #75, Hadith #412 }