It began with a knock on the door.
Rabbi Charlie Cytron-Walker let the man who had knocked into his synagogue, Congregation Beth Israel, in the suburbs of Forth Worth, Texas.
The man was cold so Rabbi Charlie, as he's known, made him a cup of hot tea.
The Saturday morning Shabbat service started.
Rabbi Charlie stood on the bimah, the raised platform at the front of a synagogue. He began a prayer.
"I was facing away from the congregation. When Jews pray, we pray towards Jerusalem," he said.
Then, he heard a click.