What is the prayer before the Ambon?

Could you please explain what is the significance and meaning behind the prayer that is traditionally recited before the Ambon, a religious ceremony or artifact? What are the origins of this tradition and what does it symbolize for the believers? Is it a mandatory part of the ritual or is it optional? Also, are there any specific prayers or verses that are commonly used for this occasion? Thank you for shedding light on this cultural and religious aspect.