La ilaha illallah

Sayyiduna Anas (RadhiAllaho anho) narrates
that Rasulullah (Sallallahu Alaihi Wasallam) said:

Say

Subhanallah
(Glory be to Allah Who is above all faults)

Alhamdulillah
(All Praise be to Allah)

La ilaha illallah
(There is none worthy of worship except Allah)

and

Allahu Akbar
( Allah is the Greatest ),

this causes the sins to fall like leaves fall from trees.

{ Musnad Ahmad }