In the book of Matthew--the sixth chapter makes numerous references to prayer:
"And when you pray....(vs 5)....when you pray....(vs 6)....when you pray....(vs 7)
Notice it doesn't say "If you pray..."
I've been contacted to pray today by another friend, feeling sick. I don't know any other details.
I don't need to know. They know, and God knows, and that's enough.