Go to Project permissions and remove the groups/roles you would like to block from "Delete issue" permission.
https://confluence.atlassian.com/display/JIRA/Managing+Project+Permissions
To validate if the permissions change worked (as mentioned by Bhushan) you can run the permission helper to do so:
https://confluence.atlassian.com/display/JIRA/JIRA+Admin+Helper#JIRAAdminHelper-PermissionHelper
Cheers
Luciano Fagundes
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