mahAnyAsaM is recited to purify the body, mind and soul of all the impurities. It is a part of the methodology of chanting of the rUdraM on special occasions such as ekAdasha rUdraM , laghu rUdraM , mahA rUdraM and ati Rudram. It invokes different deities and in the different limbs (anga’s) of the chanter. Such an invoking is done to seek the blessings of the Lord, and at the same time giving one and all a feeling of the immediate presence of the Lord in the vicinity of the chanting. The self- purification process is mandatory prior to the chanting of Sri rUdraM during the special occasions mentioned above . So rUdra kalAs are invoked within the devotee to become a rUdra himself, who can then commence the worship of the shivalinga. It must be remembered that the mahAnyAsaM confers on the person purity for that particular occasion only and not throughout the day and much less throughout one’s lifetime.There are many versions of the mahAnyAsaM but in case of shuklayajurveda ‘brihad-pArAshara smritiukta ‘ version is employed.