You need to watch this video!!!!!!

Leah Still and her dad Devon joined "TMZ Sports" on FS1 and explained why they felt compelled to reach out to a 14-year-old girl who's been bullied because she has leukemia.

As we previously reported, Devon reached out to Nicole Pfister and her family and offered to take them all to Disney World to raise their spirits after Nicole was targeted by cyber bullies.

But 5-year-old Leah -- who famously battled cancer -- says she was equally moved by the little girl's story and offered up some sage advice to Nicole that you really need to watch.