Luke 24:51
While He was blessing them, He left them and was carried up into heaven.
What it says
While he is blessing them, he leaves them and is carried up into heaven.
What it is doing
His departure happens in the act of blessing.
In context
50When Jesus had led them out as far as Bethany, He lifted up His hands and blessed them. 51While He was blessing them, He left them and was carried up into heaven. 52And they worshiped Him and returned to Jerusalem with great joy, 53praising God continually in the temple.