Blessed is that servant, whom when his lord shall come he shall find so doing.
Blessed is that servant, whom his lord when he cometh shall find so doing.
Blessed (happy, fortunate, and to be envied) is that servant whom, when his master comes, he will find so doing.
Happy are those servants whom the master finds fulfilling their responsibilities when he comes.
Blessed is that servant, if, when his lord has arrived, he shall find him doing so.