Rehras Sahib is the Sikh evening prayer, recited at sunset at the close of the working day. It is not a single composition but a collection of hymns drawn from the Guru Granth Sahib, from the compositions of several of the Gurus, together with passages from the Dasam Granth attributed to Guru Gobind Singh, arranged into a set order for daily recitation. Its hymns give thanks, seek God's grace, and reflect on the divine name and the transience of worldly life, marking the transition from the labours of the day to the evening with an act of remembrance and gratitude. Recited daily by observant Sikhs, individually or in congregation in the gurdwara, Rehras is one of the fixed prayers (nitnem, the daily rule) that structure the Sikh devotional day alongside the morning and night prayers. Its assembling of hymns from across the scripture and the tenth Guru's collection into a single evening office reflects the ordered discipline of daily prayer that the tradition sets before its followers.
Its compiled character, drawing hymns from several different Gurus across roughly two centuries of Sikh scripture alongside later material from the Dasam Granth, distinguishes Rehras from morning prayers such as Japji Sahib, which are single-authored compositions, and communities and scholars have debated the exact set and order of hymns that should make up the evening prayer, since minor variations exist between printed prayer books used in different regions and denominational strands of Sikhism.