What did the risen Jesus say as he stood among his disciples behind locked doors in John 20?

Answer: Peace be with you!

On the evening of the first day, Jesus stood among them and said, "Peace be with you!" then showed them his hands and side.

“It was the first day of the week, and that very evening, while the disciples were together with the doors locked for fear of the Jews, Jesus came and stood among them. “Peace be with you!” He said to them.”— John 20:19 (BSB)