I am trying to get a better understanding about Islam, for the reasons of not only research, but spirituality. I have been watching videos of people taking the shahadah and I have noticed that after it is completed, the imam leads a chant where the congregation yells "Allahu Akbar".
Here is a video demonstrating this: https://www.youtube.com/watch?v=rfNbMUQZiec
Now, what is that phrase that the imam says in between every "Allahu Akbar"?
Pardon my ignorance; I'm just learning the basics at this point.