During the action of this play (or poem), Samson is in prison.  While he is there, he is visited by many people.  Among the people who visit him is his father, Manoa.

Manoa tempts Samson by offering Samson his freedom.  He tells Samson that he has arranged to pay a ransom that will allow Samson to go free.  He tells Samson that he is content with the idea that he will spend the rest of his life caring for Samson.  He talks about the possibility that maybe Samson will regain his sight.

So, Manoa tempts Samson with visions of freedom and being cared for.