The importance of sesame and kusha in the Shraddha performed in Pitrupaksha is explained by this mantra. In which Lord Vishnu says that mole originated from my sweat and Kush from my body follicles. The origin of Kush should be known of Brahma, the middle Vishnu and the forepart Shiva. These are considered as iconic in Dev Kush. Brahmin, Mantra, Kush, Agni and Tulsi are never stale, they can be used again and again in worship.