Japanese
The same version of the precepts written in Japanese

Shoufuku no hihoo Manbyo no ley-yaku
Kyo dake wa
Okolu-na Shinpai suna
Kansha shite
Goo hage me
Hito ni shinsetsu ni

Asa yuu gassho shite kokoro ni neji kuchi ni tonaeyo
Shin shin kaizen

Usui Reiki Ryoho
Chosso Usui Mikao

Western
The Reiki Precepts according to the Western Branch of the system of Reiki:

Just for today do not worry
Just for today do not anger
Honour your parents, teachers and elders
Earn your living honestly
Show gratitude to every living thing

Hawayo Takata
Another interpretation by Hawayo Takata of the 5 Reiki Precepts

Just for today, thou shall not anger
Just for today, thou shall not worry
Just for today, we shall count our blessing
Just for today Do our work honestly
Just for today To be kind to all things that have life

Hyakuten Inamoto
The 5 Reiki Precepts as supplied by Hyakuten Inamoto

Today only
Do not anger
Do not worry
With thankfulness
Work diligently
Be kind to others