Kasab is the only one of 10 Pakistani terrorists who was captured after the 2008 terror attack in Mumbai that left 166 people dead and almost sent India and Pakistan to war.
'Modi's crime cannot be condoned because he observes a fast. I appeal to all Muslims and Hindus to simultaneously observe 'roza' and 'upvas' (fast) seeking divine intervention to ensure punishment for the man responsible for the killing of innocent Muslims in Gujarat,' he said.
In his nationally televised speech, Modi took a swipe at his own political tribe, saying most politicians were only keen to win the next election.
'This is how politicians work. They are swayed by vote bank politics. This is how programmes are made,' he said in chaste Hindi.
'This is how 60 years have been spent. Gujarat has come out of this (model). We will not run a government only to win elections. Today we have shown the real path of development.'
Seated on the stage were BJP leaders Sushma Swaraj and M. Venkaiah Naidu, who heard the comment with blank expression on their faces. Others on the stage included Hindu and Muslim religious leaders.
And although Modi did not speak about his widely speculated national ambitions, he sought to underline what had gone wrong with India and its leaders.
India and Indians, Modi complained, had stopped dreaming.
'This is the root of all our problems. China has big dreams, America has big dreams...'
Image: Gujarat Chief Minister Narendra Modi with Jharkhand CM Arjun Munda and actress Hema Malini on the third and final day of his fast in Ahmedabad on Monday.