Jesus said that where how many are gathered together in his name, he is there with them?

Answer: Two or three

Jesus said, "Where two or three gather together in My name, there am I with them."

“Again, I tell you truly that if two of you on the earth agree about anything you ask for, it will be done for you by My Father in heaven. For where two or three gather together in My name, there am I with them.””— Matthew 18:19-20 (BSB)