Japji Sahib is a Sikh prayer, that appears at the beginning of the holy scripture of the Sikhs, the living Guru, Guru Granth Sahib. It was composed by Guru Nanak Dev, the founder of Sikhism. It is headed by Mool Mantra and followed by 38 paudis (stanzas) and completed with a final Salok at the end of this composition.

Japji Sahib is believed to be the first composition of Guru Nanak, and considered in Sikhism as the faith's most comprehensive essence.
[1] It is regarded amongst the most important Bani or 'set of verses' by the Sikhs, as it is first Bani in Nitnem. It is notable for its discourse on what is true worship and the nature of God. It states that God is indescribable, the only true form of worship is acceptance of God, and to remain one with loving God, always.