Explanation:

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Kabir, Namdev, Ravidas, Sena were the saints of Bhakti movement.
Namdev - He was a tailor from a lower caste family. He was the great devotee of Lord Vitthala of Pandharpur. He belonged to Varakari Sect.
Kabir - He was Weaver. He was brought up by a Muslim couple. His songs and couplets are known as Doha, Sakhi or Shloka.
Ravidas - He followed the path of Nirguna Brahma. He was a cobbler and founder of Ramdasi Sampradaya. He was the disciple of Saint Ramananda.
Sena- He was a barber and belonged to the Varkari sect dedicated to Lord Vithoba. He was also the disciple of Saint Ramananda.