Follow these steps:
Step 1 Go to Manage Jenkins -> Manage Plugin.
Step 2 Search Github Plugin in the Available tab then click on Download now and install after the restart.
Step 3 Under Source Code Management tab, select Git and then set the Repository URL to point to your GitHub Repository.
Step 4 Now Under Build Triggers tab, select the “Build when a change is pushed to GitHub” checkbox.
Step 5 At the end, execute Shell script to take a clone from dev. When the configuration is done, click on save button.