You can refer to below post (check any dir and file size)
https://community.checkpoint.com/t5/Security-Gateways/Disk-Space-issues-on-Gateway/m-p/161537#M28601
Alternatively, you can check something like this:
Say to verify if there are any files bigger than 100 Mbs in /var/log dir, run this command:
find /var/log -size +100000000c
To say check files more than 400 Mbs, just replace 1 with 4
Also, check out below, its super helpful
https://support.checkpoint.com/results/sk/sk60080
Hope its helpful to you @PankajTiwari1
Cheers,
Andy