Kabir was a weaver-poet of Varanasi whose short, direct songs mock empty ritual and seek God within. He is honoured by Hindus, Muslims and Sikhs alike. Rabindranath Tagore published English versions, Songs of Kabir, in 1915.
Yes. Kabir’s poems are in the public domain.
Songs of Kabir (tr. Tagore) (1915), Bijak.