the syahadah

Asyhadualaailaahailallaah, wa asyhaduannamuhammadarrasulullah.
I bare witness that there is no god but Allah, and I bare witness that Muhammad (SAW) is the Messenger of Allah

A muslim who prays 5 times a day would have mentioned it at least 9 times daily; once during tahyaatul akhir at Subuh, and twice on each Dzuhur, Ashar, Maghrib, and Isya.
Not to mention those who perform the sunnah prayers, and those who listened to adzan and then answer the call.
In society nowadays, the syahadah is commonly viewed as a vow which marks a person's inclusion into Islam. If it is so, we could imagine how many times a muslim have re-newed his vow everyday.

Anyway, I stumbled upon this...
Surat Al-'Isrā' (The Night Journey) - سورة الإسراء
http://quran.com/17
Please read the translation, there are hints to understand of what this whole life is all about.

May this post benefits us in any way possible. In God All Knowledge Resides.