Sahih al-Jami al-Saghir — Hadith 2615

The Prophet (peace and blessings be upon him) said:
"Shall I not tell you of a deed that brings more reward than your remembering Allah continuously through the night and the day? Say: 'Al-hamdu lillahi 'adada ma khalaq, al-hamdu lillahi mil'a ma khalaq, al-hamdu lillahi 'adada ma fi al-samawati wa ma fi al-ard, al-hamdu lillahi 'adada ma ahsa kitabuh, wal-hamdu lillahi 'ala ma ahsa kitabuh, wal-hamdu lillahi 'adada kulli shay', wal-hamdu lillahi mil'a kulli shay'' (All praise is for Allah as many times as what He has created; all praise is for Allah filling what He has created; all praise is for Allah as many times as what is in the heavens and what is in the earth; all praise is for Allah as many times as what His Book has recorded; all praise is for Allah for what His Book has recorded; all praise is for Allah as many times as everything; all praise is for Allah filling everything), and likewise glorify Allah (Subhan Allah) in the same measure. Learn them yourself and teach them to your descendants after you."