Mr Shah also alleged that the Kashmir matter was taken to the UN in a hurry.
Home Minister Amit Shah on Wednesday blamed India's first prime minister Jawaharlal Nehru's "two major blunders" -- declaring a ceasefire without winning the entire Kashmir and taking the issue to the United Nations -- for the sufferings of the people of Jammu and Kashmir.
Replying to a debate in the Lok Sabha on the Jammu and Kashmir Reservation (Amendment) Bill and the Jammu and Kashmir Reorganisation (Amendment) Bill, Mr Shah said if Mr Nehru had taken the right steps, a large chunk of territory would not have been ceded and Pakistan-occupied Kashmir would have been part of India.
"I support the word that was used here -- Nehruvian blunder. Because of the blunder that was committed during the time of Nehru, Kashmir had to suffer. With responsibility, I want to say that the two big blunders that happened during the tenure of Jawaharlal Nehru, happened due to his decisions, because of which Kashmir had to suffer for years," Mr Shah said.
"Kashmir had to suffer due to Nehruvian blunders. One was that when our Army was winning and as soon as Punjab area was reached, ceasefire was declared and Pakistan-occupied Kashmir was born. If the ceasefire would have been (declared) three days later, PoK would have been part of India," the home minister said.
The ceasefire made without winning the entire Kashmir was one "blunder" and the other was taking the issue to the UN.
There was an uproar by the opposition benches over the remarks on Mr Nehru and they staged a walkout but returned later.
After their walkout, BJD leader Bhartruhari Mahtab said the home minister should also talk about the "Himalayan blunder", a reference to Mr Nehru's actions leading up to the war with China in 1962. Mr Shah quipped that his talking about two blunders had upset the opposition benches and if he had used the phrase "Himalayan blunder", they would have resigned.
Lok Sabha Speaker Om Birla said the remarks made were not an insult to anyone and were only made to put things in context.
In his remarks, Mr Shah also alleged that the Kashmir matter was taken to the UN in a hurry.
"If at all it had to be taken to the UN, it should have been sent under Article 51 rather than Article 35 of the UN Charter," he said, asserting that he of course believes that the issue should not have been taken to the UN in the first place.
Mr Shah also quoted Nehru as saying later that the ceasefire was a "mistake". Shah added that it was not Nehru's mistake but a blunder.
"So much land of this country was lost, it was a historic blunder," the home minister added.
Talking about the abrogation of Article 370, Mr Shah said it had nothing to do with going back on promise as it was a temporary article and had to go.
"You did not have the courage, PM Narendra Modi showed courage and did away with it," he said, referring to the opposition benches.
Mr Shah pointed out that the two bills on Jammu and Kashmir seek to nominate two Kashmiri Migrant community members, including a woman, to the assembly.
One seat in the Jammu and Kashmir assembly will be set aside for people displaced from Pakistan-occupied Kashmir, the home minister said.
More than 45,000 people have lost their lives due to terrorism in Jammu and Kashmir so far, he said.
Mr Shah said the government's focus was on ending the terror ecosystem in Jammu and Kashmir.
He said a plan to have zero terror incidents in Jammu and Kashmir is in force for three years and it will be successful by 2026.
"I believe Modi government will return to power in 2024 and by 2026, I hope there will be no terror incident in Jammu and Kashmir," he said.
Mr Shah said the two bills will give justice to those deprived of their rights for the last 70 years and asserted that reservation to the displaced people will give them a voice in the legislature.
He said that had terrorism been tackled at the beginning without considering vote-bank politics, Kashmiri Pandits would not have had to leave Kashmir Valley.
He said one of the bills seeks to give representation in the assembly to those who had to leave Kashmir due to terrorism.
Mr Shah also lashed out at the Congress for talking about backward classes, saying that if any party has harmed backward classes and come in the way of their growth, it is the Congress.
He said Narendra Modi was born into a poor family and became the prime minister and he knows the pain of the backward classes and the poor.
The Jammu and Kashmir Reservation (Amendment) Bill and the Jammu and Kashmir Reorganisation (Amendment) Bill were passed by the Lok Sabha on Wednesday.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)