"The sources of Dharma have been systematically divided into four simple categories....This desisting from the prohibition is what constitutes the karma, leading to Dharma.....There are many Vedic Karmas which do not find mention directly in the Vedas but are found only in the Smritis....The Agnihotra mentioned above can be performed at any one of the three times....Lord Shiva drank the deadliest poison easily. However, if anybody else did the same, he would be reduced to ashes....However, this is the weakest source of Dharma out of the four."