How did David show he believed in resurrection after his child with Bathsheba died?
After the child from Bathsheba died, David wept seven days, then stopped grieving because he could not bring the child back. He said he would go to him. This showed David understood there was a resurrection and looked forward to being with the child.
Les explains that after David lost the child from Bathsheba as a result of the adultery, he wept for seven days. When the child died, David realized he could not bring the child back, but he said he would go to him. Les says this was another reference that David understood there was a resurrection. The same unit notes that Old Testament saints believed in resurrection, citing Job's words about seeing God in his flesh and Abraham's confidence that God could have resurrected Isaac. David's response reflects that Old Testament hope.
But now he is dead, wherefore should I fast? can I bring him back again? I shall go to him, but he shall not return to me.