Durga Kavach, a part of the Durga Saptashti, is a collection of distinctive verses from the Markandey Purana. Devotees of Durga Ma consider it very auspicious to chant Durga Kavach during the Navratras.
Durga Kavach:
Atha DevyaaH Kavacham.h
AUM Asya Shrii Chandii Kavachasya
Brahmaa R^ishhiH AnushhTup.h ChhandaH Chaamundaa Devataa
Angaanyaa Soktamaataro Biijam.h Digbandha Devataa Stattvam.h
Jagadamba aPriityarthe Saptashatii PaathaaN^ Gatvena Jape Viniyogah
AUM Namash Chandikaayai
Maarkandeya Uvaacha
AUM Yadh_goohyaM Paramam Loke Sarva Rakshaakaram NR^iNaam.h
Yaanna Kasya_chidaa_khyaatam Tanme Bruuhi Pitaamaha ॥ 1 ॥
Brahmo Vaach:
Asti Goohya_tamam Vipra Sarva bhuuto pakaa_rakam.h
Devya_astu kavacham punyam takshinash_va Mahaamune ॥ 2 ॥
Prathamam Shailaputrii cha DvitiiyaM Brahmachaarinii
Tritiiyam Chandra ghanteti Kushmaan_deti Chatur_thakam.h ॥ 3 ॥