If you're referring to Wai Kru, it depends on the fighter. Most Wai Kru doesn't have any chanting, although it may look like the fighter is praying when their head is down. But every Wai Kru is different. Each gym can have it's own Wai Kru, and many gyms outside of Thailand don't have one at all. If some gyms have a chant that they do, it's their own variation and not every fighter will have anything to chant.

"Dear Lord, strike him down, so I don't have to." FACT!