“The key to the prayer (salah) is cleanliness, its beginning is takbir (saying Allahu Akbar) and its ending is salam (salutation).” (Abu Dawud, Taharah, 31: Tirmidhi, Taharah, 39)
“Keep cleaning so that your sustenance will increase...”.

“Islam is clean. Therefore, you should keep yourselves clean, too. Only the clean people can enter Paradise.” (Hadith)

“Cleanliness is the half of belief.” (Hadith)

“Cleanliness is from belief (its perfection and light).” (Hadith)

“Islam was built on the foundation of cleanliness.”

“Allah is clean; He loves clean people.”