Song: Justice and Mercy
Artist: Flyleaf
Album: Music As A Weapon EP / Much Like Falling EP
Bass: Pat Seals

I know they play in Drop D but this particular song happens to be in
Drop Db (Gb-Db-Ab-Db). 
But Pat plays it live in Drop D.

You start with:

Verse 1

Gb|------------------------------------|
Db|------------------------------------|
Ab|------------------------------------|  x2
Db|-0-3-2-0-1-1-1-1-1-1-1-1-1-1-1-1----|

Gb|------------------------------------|
Db|------------------------------------|
Ab|-----------------5-3-0-1-3-5-5-5----|  x2
Db|-0-3-2-0-1-1-1-1--------------------|

Gb|---------------------|
Db|---------------------|
Ab|---------------------|  x4
Db|-0-3-2-0-1-1-1-1-----|

Pre-Chorus 1 (0:26)

Gb|---------------------------------------------------------|
Db|---------------------------------------------------------|
Ab|--------3-3-5-5-5----------3-3-5-5-5--5-5-5-5-5-5-5-5----|  x1
Db|-1--1---------------1--1---------------------------------|  

Chorus 1 (0:32)

Gb|--------------------|
Db|--------------------|
Ab|-------------5b~~---|  x6
Db|-0-0-0-5-3-0--------|


Gb|--------------------------------------------|
Db|--------------------------------------------|
Ab|--------3-3-5-5-5----------3-3-5-5-5--------|  x1
Db|-1--1---------------1--1-------------0~~~---|

Verse 2 (0:53) same as Verse 1
Pre-Chorus 2 (1:18) same as Pre-Chorus 1
Chorus 2 (1:24) same as Chorus 1

Bridge (1:44) (slow)

Gb|---------------------------------|
Db|---------------------------------|
Ab|---------------------------------|  x3 
Db|-3-3-3-3--10-10-10-10--0-0-0-0---|

Gb|------|
Db|------|
Ab|------|  let it ring
Db|-3~~--|

Chorus 3 (2:07) same as Chorus 1

That's it!
remember it's Drop D and half step down ;)
Enjoy it ^^