Show posts from each category like mixed in same list

i am using Laravel 5.2 for my project.

I have a list that shows posts. I have 2 different categories. I'm showing them in a list with foreach loop. Every category in that list fetches 6 post from model. What i want to do is , showing them in one list like they mixed. One from first category one from second category.

Example List:

- This post from News Model 
- This post from Blog Model 
- This post from News Model 
- This post from Blog Model 
- This post from News Model 
- This post from Blog Model 

How can i achieve this , thank you !

via Chebli Mohamed