Foam of the Sea

Narrated Abû Huraira radhiAllâhu `anhu: Allâh's Apostle (sallAllâhu `alayhi wa sallam) said, 

"Whoever says, 'Subhan Allâh wa bihamdihi,' o­ne hundred times a day, will be forgiven all his sins even if they were as much as the foam of the sea." 

[Sahîh Al-Bukhari]

Narrated Abû Hurayrah radhiAllâhu `anhu: Allâh's Apostle (sallAllâhu `alayhi wa sallam) said: 

"If anyone extols Allâh after every prayer thirty-three times [SubhanAllâh], and praises Allâh thirty-three times [Alhamdulillah], and declares His Greatness thirty-three times [Allâh hu Akbar], ninety-nine times in all, and say to complete a hundred: "There is no god but Allâh, having no partner with Him, to Him belongs sovereignty and to Him to praise due, and He is Potent over everything," his sins will be forgiven even if these are as abundant as the foam of the sea." 

[Sahîh Muslim]