The Arabic Letter Sad - 38:43 We returned to him his offspring with a multiplicity of them. This is a mercy and a message from Us to those who have understanding.
In the context of 41, 42...44; related to the call of the prophet Ayyub to his Lord:
The Prophets/21:83 "And Ayyub... He had supplicated to his Lord thus: "A calamity has touched me. You are the most merciful of the merciful."
The Prophets/21:84 We answered him and removed whatever affliction he had. And We gave him and his family and their like as a mercy from Us and a reminder to those who serve.