The Guru Granth Sahib begins with the word "Ek Onkar" – The All Pervading Being. From this Word to the tenth Word “Gur-parshad” is called the Mool Mantra. After this is the rest of the composition called the Japji composed by Guru Nanak Dev. This comprises 38 Pauris or stanzas, a Prologue and an Epilogue. This is one of the morning prayer of the Sikhs.
The next composition has two parts - (1) "So Dar" and (2) "So Purkh". The Bani, "So Dar" contains 5 Shabads and "So Purkh" contains 4 Shabads. This form most of the evening prayer of the Sikhs and is called the Rehras. After this is the Bani called Sohila (full name, Kirtan Sohila), which contains 5 Shabads and is the bed-time prayer.