"Call to me and I will answer you, and will tell you great and hidden things that you have not known."
Jeremiah 33:3 ESV
A Bible teacher I had in high school called this the Lord's phone number: JER 33-3.
(Does anyone else remember when phone numbers had an alphabetical prefix? When I was little, ours was CI2 - followed by four numbers. I don't remember how old I was when they converted to all numbers, then they added area codes...)